II. States’ reaction to the Russian invasion and their justifications for support

In response to the Russian aggression, we have seen a wide variety of reactions by states supporting Ukraine, ranging from diplomatic condemnation and the imposition of sanctions to material support in the form of financial aid and weapons delivery. Diplomatic condemnation occurred primarily through the UN General Assembly and other UN bodies. In the first Emergency Special Session on the Russian attack against Ukraine, 141 states voted in favour of UN General Assembly (UNGA) Emergency Special Session Resolution 11/1 on 2 March 2022, condemning Russia aggression against Ukraine and the violation of UN Charter Article 2(4), a picture repeated on 24 March 2022 when 140 states voted in favour of Emergency Special Session Resolution 11/2 (UN General Assembly 2022a, 2022c; United Nations 2022a, 2022b). On 7 April 2022, Russia’s membership of the UN Human Rights Council was suspended (UN General Assembly 2022d), while on 12 October 2022, 143 states voted to condemn Russia’s illegal annexation of four Ukrainian regions (UN General Assembly 2022e). In November 2022, the UNGA adopted Emergency Special Session Resolution 11/5, which dealt inter alia with the issue of remedy and reparations (UN General Assembly 2022b). In February 2023, one year after Russia’s full-scale invasion of Ukraine, the UNGA backed a resolution condemning Russia’s invasion and stressing the ‘adverse impact of the war on global food security, energy, nuclear security and safety and the environment’ (UN General Assembly 2023). The UN Human Rights Council has condemned the attack, as has the G7 (G7 2022). In addition, the Human Rights Council established an independent commission investigating human rights violations and abuses in Ukraine (Human Rights Council 2022).

Moreover, states have called out Russian actions as war crimes and have begun to support Ukraine in collecting evidence of such crimes for later prosecutions. The International Criminal Court (ICC) opened an investigation on 2 March 2022 after a record-breaking 43 member states referred the situation to the Court (ICC 2022). Following the referral and an investigation by the ICC, in March 2023 the Court unsealed an arrest warrant against Russian President Vladimir Putin and the Commissioner for Children’s Rights in the Office of the President of the Russian Federation, Maria Alekseyevna Lvova-Belova. An unsealed arrest warrant against an acting president and a president of a country with permanent membership in the UN Security Council is unprecedented. The arrest warrant focuses on the deportation of Ukrainian children as a war crime (ICC 2023; Kersten Reference Kersten2023; Vasiliev Reference Vasiliev2023).

While most states condemned Russia’s behaviour by voting in favour of the above-mentioned resolutions or making statements supporting Ukraine, very few states sided with Russia, voting against the resolutions, and only some abstained. Voting in favour of the resolutions shows the diplomatic support of many states in the UNGA. However, how and to what extent states have assisted Ukraine varies starkly. Some have asserted pressure against Russia by implementing economic sanctions or providing financial support to Ukraine. Other states have gone so far as to provide military intelligence and deliver weapons to Ukraine. This has often included not only the weapons but also munitions or ammunition, technical support, medical treatment and military training (Antezza et al. Reference Antezza, Frank, Franz, Kharitonov, Kumar, Rebinskaya, Trebesch and Trebesch2023). In summary, we see that many states support Ukraine vis-à-vis Russia, but the level and type of support have varied considerably.

State behaviour beyond diplomatic support is noteworthy because states have no legal obligation to support Ukraine in such a substantive manner, including the delivery of weapons. Neither the UN Charter nor ius ad bellum or ius in bello obliges states to support another state under attack. The UN Security Council (UNSC) can authorize the use of force to restore international peace and security under Chapter VII of the UN Charter. Given that the aggressor – in this case, Russia – is a permanent UNSC member, a UN-led or UN-authorized intervention is highly unlikely.Footnote ¹ In such cases where the Council is unable or unwilling to act, states under attack retain a right to individual and collective self-defence under Article 51 of the UN Charter.

Individual self-defence is usually understood as defending the state against an armed attack without the direct support of a third party, while collective self-defence refers to a third party assisting the state under attack with force (Padmanabhan and Shih Reference Padmanabhan and Shih2012: 4). Ukraine has asked for other states’ support, but not for their direct involvement, as states made it clear early on that this was not an option. And even in those few instances where direct involvement was requested by Ukraine, such as calls for the implementation of a no-fly zone, it was strongly rejected by those states supporting Ukraine (McCroary and Lewis Reference McCroary and Lewis2022). This, in our reading, means that Ukraine is exercising individual self-defence with the support of other states, but that the support does not constitutes collective self-defence.Footnote ²

How do states justify their support for Ukraine, especially when it goes beyond diplomatic support? States supporting Ukraine militarily, especially NATO states, refer to Ukraine’s right to individual self-defence in their justifications for their military support (Blinken Reference Blinken2023; NATO 2023). In doing so, they underline their responsibility to support Ukraine’s right to individual self-defence. Perhaps the most interesting case of military support is Germany. For well-known historical reasons, post-World War II-Germany had a strong conviction that it should not deliver weapons into active conflicts. Yet it took only two days to decide to deliver weapons to Ukraine to enable its self-defence (Herszenhorn et al. Reference Herszenhorn, Bayer and von der Burchard2022). In a special session of the German Bundestag, Chancellor Olaf Scholz (Reference Scholz2022) declared that this was the only possible answer to Putin’s aggression. In the same session, Foreign Minister Annalena Baerbock (Reference Baerbock2022) clarified that the decision to support the Ukrainian military was not taken lightly, but it was within Germany’s and its Allies’ responsibility to do so. The notion of responsibility was also reiterated in statements by NATO Secretary-General Jens Stoltenberg, such as the following in November 2022:

This brief discussion of the legal foundations and the illustrations for states’ justifications demonstrates that there is no clear legal obligation to support Ukraine with weapons. Existing norms do not obligate such support. Instead, states draw on norms, such as Ukraine’s right to self-defence (Article 51, UN Charter) when justifying their behaviour. So, while the support we have seen is clearly permissible, it is not a legal obligation. Therefore, we see the military support for Ukraine as a case where states overfulfil an existing norm.

But what does an overfulfilment of a norm mean? So far, constructivist approaches have not provided a compelling answer to this question. At the same time, the observed behaviour similarly constitutes a puzzle for approaches that do not consider normative questions or ethical issues. Given the normative and moral-based justifications for supporting Ukraine, we hold that by bringing together more critical constructivist perspectives with research on responsibility, we can provide the basis of the necessary conceptualization and a better understanding of such behaviour. Before offering our conceptualization of state behaviour, Part III briefly discusses two strands of literature: current research on the Russian war against Ukraine and existing research on the relationship between norms and responsibility.

III. A brief survey of the literature

The Russian aggression against Ukraine before 2022 has been subject to ample academic analysis (Eisler et al. Reference Eisler, Havercroft, Shaw, Wiener and Kang2022, 5). The illegal annexation of Crimea in 2014, for example, was studied by Betcy Jose and Christoph H. Stefes (Reference Jose and Stefes2022) focusing on Russia’s normative agenda. In addition, scholars have offered different explanations for the annexation and conducted analyses from different theoretical perspectives and disciplines, including international law, constructivism and area studies (Bering Reference Bering2017; Gardner Reference Gardner2016; Hopf Reference Hopf2016).

When it comes to the analysis of Russia’s full-scale invasion on 24 February 2022, scholarly work has focused on the explanatory power of different IR theories, with a particular focus on the question of whether (neo)realism offers the most convincing explanation (Mearsheimer Reference Mearsheimer2022; Rösch Reference Rösch2022; Walt Reference Walt2022; van Rythoven Reference van Rythoven2022; Zürn Reference Zürn2022). From the neorealist perspective, power relations and different geopolitical interests are crucial in explaining the behaviour of Russia and the NATO states. In this sense, weapons delivery would be an expression of security interests by NATO states.

However, these explanations ignore normative and ethical issues related to the question of what behaviour is right (Ralph Reference Ralph2018). Moreover, this perspective fails to explain why not only NATO states but the vast majority of states supported the condemnation of Russia’s behaviour in the UNGA, and many non-NATO members also delivered weapons. Thus, we move away from the dominant focus of the debate on whether (neo)realism offers a valid explanation for the Russian war against Ukraine. We do so by shifting from finding explanations for Russia’s behaviour to assessing and typologizing the behaviour of states not directly involved in the conflict.

To this end, we suggest focusing on norms given that, while different understandings and types of norms exist, all norms contain normative expectations about a specific behaviour of actors (Jurkovich Reference Jurkovich2020: 694–95; Winston Reference Winston2018: 3). Therefore, it seems clear that to understand the variation in state behaviour, we need to understand how the behaviour of actors is related to norms. Importantly, in our understanding, norms are not fixed in their meaning. Rather, we understand them as both procedural and as things (Krook and True Reference Krook and True2012), ‘as soft institutions’ (Orchard and Wiener Reference Orchard, Wiener, Orchard and Wiener2023: 6). Their meaning is determined in-use (Wiener Reference Wiener2009). The long-existing research tradition on norms has answered questions such as how norms emerge (see Finnemore and Sikkink Reference Finnemore and Sikkink1998) and why actors comply (Chayes and Chayes Reference Chayes and Chayes1993; Wiener Reference Wiener2004). Yet, as we have shown elsewhere in more detail (Gholiagha and Sienknecht Reference Gholiagha, Sienknecht, Orchard and Wienerforthcoming), one issue remains under-theorized: situations in which actors overfulfill norms. Conceptualizing such behaviour falls under normative theorizing, which to this day remains a challenge for IR norms scholarship (Erskine Reference Erskine2012; Havercroft Reference Havercroft, Steele and Heinze2018). We turn to responsibility literature to fill this gap and enable norms research to study situations of norm overfulfilment.

Regarding responsibility as a second central literature for our contribution, it has received growing attention in IR literature (Erskine Reference Erskine and Erskine2003b, Reference Erskine, Reus-Smit and Snidal2008; Hansen-Magnusson and Vetterlein Reference Hansen-Magnusson and Vetterlein2020, Reference Hansen-Magnusson and Vetterlein2021; Sienknecht and Vetterlein Reference Sienknecht and Vetterlein2023). Here, relevant work has discussed questions of moral agency (Hoover Reference Hoover2012; Erskine Reference Erskine2003a, Reference Erskine, Reus-Smit and Snidal2008) and the capacity to act (Bukovansky et al. Reference Bukovansky, Clark, Eckersley, Price, Reus-Smit and Wheeler2012). Both concepts are central to assessing whether and how a state should act – in other words, under which conditions and in which situations a state acts responsibly. So far, scholars have discussed the necessity of such responsible behaviour in specific policy fields (Park and Vetterlein Reference Park and Vetterlein2010) and have focused on the notion of responsibility in context-specific norms such as the responsibility to protect (Arbour Reference Arbour2008). Relevant literature in the field has underlined that responsibility can best be understood as a concept that sets actors, objects and norms in relation to each other (Sienknecht Reference Sienknecht, Hansen-Magnusson and Vetterlein2021a; Sondermann et al. Reference Sondermann, Ulbert, Finkenbusch, Ulbert, Finkenbusch, Sondermann and Debiel2018). We argue and demonstrate in the following section that this relational understanding, combined with an ethical standpoint, helps to distinguish different norm-related behaviour.

IV. Conceptualization of state behaviour

This section presents a typology of norm-related behaviour we have developed in more detail elsewhere (Gholiagha and Sienknecht Reference Gholiagha, Sienknecht, Orchard and Wienerforthcoming). The typology is based on norms and responsibility as two central concepts in IR and reference points in global politics. In this section, we present the four types of norm-related behaviour and our typology.

Building on the above presented norm conceptualization, we assume that a shared understanding of the norm in a given situation is possible to identify for researchers. In the context of the Russian war against Ukraine, the prohibition of the use of force (Art. 2(4) UN Charter) and Ukraine’s right to individual self-defence (Art. 51, UN Charter) constitute the most relevant norms and define which behaviour is seen as (in)appropriate for the conflict parties. Of course, this shared understanding is not fixed, but depends on the context in which the norm is applied and the norms’ meaning-in-use (Gholiagha et al. Reference Gholiagha, Hansen-Magnusson, Hofius, Engelkamp, Glaab and Graf2021; Wiener Reference Wiener2009); what is deemed (in)appropriate depends on the position of an actor. What interests us here is what kind of behaviour is regarded as norm-appropriate for the states that are not direct parties to the conflict.Footnote ³

In the remainder of this part, we present our typology of norm-related behaviour. We identify four types of norm-related behaviour: appropriate, inappropriate, irresponsible and responsible. In the following, we detail our core assumptions and conceptual suggestions regarding the distinction of behaviour.

Responsible behaviour

Finally, responsible behaviour is defined as instances where an actor goes beyond what the norm requires.Footnote ⁶ We turn to the notion of responsibility to conceptualize such behaviour that goes beyond a norm and over-fulfils its normative expectations. Responsibility is constituted through the relationship between a subject and the things or people (objects) for which the subject accepts responsibility based on norms (Sienknecht Reference Sienknecht, Hansen-Magnusson and Vetterlein2021a; Zimmerli and Aßländer Reference Zimmerli, Aßländer and Nida-Rümelin1996). This triangular relationship is not static, but dynamic. Norms affect subjects’ behaviour, and subjects’ behaviour influences for what and whom responsibility is taken, which in turn might lead to norm development. The objects of responsibility could challenge existing norms and advocate for new norms (e.g. in the area of new technologies) with the actors they consider responsible. Following this triangular relationship, we identify three configurations of responsible behaviour on the normative, subject and object dimensions.

Responsible behaviour can manifest on the normative dimension. For example, we introduced the ‘developmental aid norm’ example above as an example of inappropriate behaviour when states fall short of the 0.7 per cent GNI threshold. Conversely, responsible behaviour would be the case when a state provides aid above the 0.7 per cent GNI threshold, thus overfulfilling the normative behavioural prescription of the norm.

Regarding the subject dimension, responsible behaviour occurs when new actors come on board. Here, new actors and/or actors that have previously not been a norm addressee follow a norm. An example would be non-governmental organizations that adhere to the ‘rescue-at-sea’ norm because they think the norm is justified, actors addressed by the norm violating it (such as with push-back operations) or actors addressed by the norm failing to respond appropriately (e.g. downsize or cancel rescue missions).Footnote ⁷

Finally, responsible behaviour can relate to the object dimension. Here, actors decide to take responsibility for (new) people or things. An example would be the current debates about artificial intelligence (AI) regulations, where actors try to determine the appropriate course of action. Without a specific norm in place, they might draw on existing norms from other issue areas.

Figure 1 outlines the four types of norm-related behaviour. On the left side, we have either appropriate or inappropriate behaviour in relation to a norm. These two types of behaviour are co-constitutive of each other. On the right side, we have responsible and irresponsible behaviour, again being co-constitutive of each other. Notably, we also have a connection between appropriate behaviour and responsible behaviour. Here, we assume that actors may move from appropriate to responsible behaviour or vice versa, making these two types constitutive of each other. The same holds for inappropriate and irresponsible behaviour.

Figure 1

A typology of norm-related behaviour.

Source: Authors.

Before applying our typology to the situation of the Russian war against Ukraine, it is necessary to provide an epistemological reflection. In applying the typology, it becomes apparent that the same behaviour of different actors, or even the same behaviour of the same actor in different situations or different moments, leads to a different assessment of their respective behaviour. While on the face of it this may seem to cause an epistemological challenge, namely that we cannot say with certainty which kind of empirically observed behaviour constitutes which specific type, a closer look reveals a different picture. Given that norms are always and only assessable in their specific context and meaning-in-use (Gholiagha et al Reference Gholiagha, Hansen-Magnusson, Hofius, Engelkamp, Glaab and Graf2021; Wiener Reference Wiener2009), and also situation-dependent, the seeming epistemology challenge turns into a necessary characteristic of norm-related behaviour. That is to say, our typology does not aim at explaining a specific behaviour but instead at conceptualizing different behaviour, which in turn allows for a better understanding of the differences we can observe empirically. In sum, we focus on the behavioural and value-oriented dimensions of norms by referring to the concept of responsibility. Determining whether a specific behaviour goes beyond what the norm requires can only occur on the empirical level and not on an abstract theoretical or conceptual level.Footnote ⁸

Take, for example, NATO’s decision to intervene in Kosovo. Justifications were based on NATO’s assessment that there was impeding genocide and the international community was morally obliged to act in the absence of UNSC authorization and in the absence of a clear norm that would legitimize such an intervention (Lang Reference Lang2009: 186). By intervening militarily, NATO violated several existing norms, such as the prohibition of the use of force, sovereignty and non-interference (Independent International Commission on Kosovo 2000). This makes it clear that NATO did not act in a norm-free environment but decided to prioritize the norm of genocide prevention over the other relevant norms mentioned above. At the same time, the intervention became a turning point in debates about humanitarian interventions (Annan Reference Annan1999; Habermas Reference Habermas1999; Gholiagha Reference Gholiagha2015).

The issue of norm violation as part of responsible behaviour raises an important point. Norms never exist in isolation and it is rarely, in a specific situation, only a single norm is perceived as applicable. Often, actors are even in a situation where norms applicable to the same situation are perceived as incompatible with each other. Legal scholarship and IR norms research literature have discussed these cases in detail under the notion of norm conflicts (Michaels and Paulwelyn Reference Michaels and Paulwelyn2011; Vranes Reference Vranes2006) and norm collisions (Buitelaar and Hirschmann Reference Buitelaar and Hirschmann2021; Gholiagha. Holzscheiter and Liese Reference Gholiagha, Holzscheiter and Liese2020; Holzscheiter, Gholiagha and Liese Reference Holzscheiter, Gholiagha and Liese2021; Saltnes Reference Saltnes2017), respectively. As a result of such collisions, following a norm as part of responsible behaviour may indeed constitute inappropriate behaviour in relation to other norms.Footnote ⁹

The second epistemological question is who decides whether a specific behaviour by an actor in a specific situation is, for example, responsible?Footnote ¹⁰ Here, we would hold that this depends on the assessment of the relevant political actors affected by the political problem. Depending on their positionality and their normative beliefs, that assessment may differ. Take, for example, the UN General Assembly Special Emergency Sessions on the Russian war against Ukraine. Here, most states found Russia violating Article 2(4) of the UN Charter. Our typology can then be used to categorize Russia’s behaviour as inappropriate from the perspectives of the international community. In addition, scholars applying the typology must reflect their positionality and be transparent about their assessment. In sum, there exists no Archimedean point from which a situation can be ‘objectively’ assessed. Therefore, the following assessment is also based on our positionality as liberal Western-educated scholars.

V. State behaviour in the context of the Russian war against Ukraine

We now apply our typology to states’ support for Ukraine.Footnote ¹¹ To recall, we take a liberal standpoint in assessing the Russian war against Ukraine. Hence, we share the view of most states that Russia’s attack against Ukraine violates international law – for example, Article 2(4) of the UN Charter violates several other international norms and cannot be justified by reference to either international law or relevant norms, such as those found in the UN Charter.Footnote ¹² At the same time, we agree that Ukraine has the right to defend itself against the Russian invasion. Moreover, in this specific case due to Ukraine’s lack of sufficient resources in terms of both finance and weapons, we share the view that not only financial aid but weapons delivery is necessary so Ukraine can fulfil its right to self-defence. In the following, we apply the four types of norm-related behaviour to our empirical case. Figure 2 summarizes the four types of norm-related behaviour in relation to Ukraine’s right to self-defence.

Figure 2

Typology of norm-related behaviour in the Russian war against Ukraine.

Source: Authors.

Appropriate behaviour of states in this context means adherence to fundamental norms such as the prohibition of the use of force and the right of self-defence. States displaying such behaviour condemned the Russian attack, calling for upholding these norms and stressing that such an attack violated international law. We operationalize such behaviour through diplomatic support for Ukraine. States that fall into those categories have voted in favour of UN resolutions condemning the full-scale Russian invasion of 24 February 2022, have made statements through their governments or heads of state to that effect or have supported measures such as diplomatic or economic sanctions. Examples of this behaviour can be observed from many states: 141 states have adopted a resolution (sponsored by 90 countries) in an emergency special session of the UNGA, which demands Russia’s withdrawal from Ukraine’s territory and reaffirms Ukraine’s sovereignty, independence and territorial integrity (UN General Assembly 2022a). Stricto sensu, it would have also been appropriate to intervene in support of Ukraine militarily as an act of collective self-defence under Article 51 of the UN Charter. Given that, as mentioned above, states clearly rejected calls for direct military involvement, the notion of appropriate behaviour does not comprise the additional support we have observed.

Inappropriate behaviour in this context means state behaviour that openly supports Russia. It is inappropriate because supporting an aggressor constitutes a norm violation. Thus, state behaviour that aims to support Russia diplomatically or even by delivering weapons constitutes inappropriate behaviour in the current international order. Examples include states that voted against the UNGA resolutions named above, such as Belarus, North Korea, Syria and Eritrea. Another example would be states that support Russia materially by delivering weapons, such as Iran (Wintour Reference Wintour2022). Furthermore, delivering drones and missiles to Russia violates UNSC Resolution 2231 (Arms Control Association 2022; UN Security Council 2015). In addition, not providing diplomatic support – for example, through abstention – would, from our position, also constitute inappropriate behaviour.

The third type of norm-related behaviour is irresponsible behaviour. One example of such behaviour is the case of prima facie neutral behaviour. While neutrality often entails a positive asset, we define it in this context as irresponsible behaviour. One example is states such as China or India, which by taking what seems to be a neutral position in the conflict are actually acting irresponsibly, as they have the means to change the situation by exerting diplomatic pressure on Russia but do not choose to do so.Footnote ¹³ Switzerland constitutes another example of such behaviour, as it has denied medical treatment of wounded Ukrainians, stating that this may pose a risk to its neutral position (Swissinfo 2022). However, on closer inspection, it becomes clear that this decision is not neutral but – following our typology – irresponsible, given that Switzerland would have the capacity to provide treatment and hence improve the situation of wounded Ukrainians.

The fourth type of norm-related behaviour would be responsible behaviour, which is described as behaviour that ‘goes beyond behaviour that is regarded as appropriate’ (Gholiagha and Sienknecht Reference Gholiagha, Sienknecht, Orchard and Wienerforthcoming: 3). In this concrete context, there is no (legal) obligation to support Ukraine financially or militarily, so behaviour that goes beyond the diplomatic support for Ukraine’s right to individual self-defence constitutes responsible behaviour as it displays an over-fulfilment of the normative dimension. The following provides a detailed analysis of this behaviour.

In early 2022, debates about weapons delivery for Ukraine began to increase amidst Ukrainian fears about a Russian attack. Among those who were reluctant was Germany, which in January 2022 only committed to sending 5000 protective helmets to Ukraine (Tagesschau 2022). However, when Russia attacked Ukraine in February 2022, the behaviour of many states changed substantially. Within days after Russia’s attack, the German government – among others – announced the delivery of weapons to Ukraine (Talmom Reference Talmom2022). As the Ukraine Support Tracker data from the Kiel Institute for the World Economy demonstrates, several states began delivering weapons, including heavier weapon systems such as multi-rocket launch systems (Antezza et al. Reference Antezza, Frank, Franz, Kharitonov, Kumar, Rebinskaya, Trebesch and Trebesch2023; Trebesch et al. Reference Trebesch, Antezza, Bushnell, Frank, Frank, Franz, Kharitonov, Kumar, Rebinskaya and Schramm2023).

How did governments justify the delivery of these weapons? In various speeches and statements, references are made to the right of self-defence of Ukraine that is supported by arms deliveries. Ukrainian freedom, democracy, security and liberty are also recurring themes (Biden Reference Biden2022; Merkur 2022). However, reference is also made to protecting human rights and preventing crimes (German Federal Foreign Office 2022). Finally, actors often mention that helping Ukraine defend itself is part of something bigger: the defence of freedom or, more specifically, the European peace order (Popp Reference Popp2022). Table 1 summarizes the reactions, our operationalization and the corresponding type of behaviour.

Table 1.

Reactions, operationalization of reactions, and the corresponding norm-related behaviour

Source: Authors.

Before turning to the effects of such behaviour on norm development, we need to engage with one possible counter-argument to our analysis. An alternative assessment to that offered here is that the weapons delivery should be understood as an act of collective self-defence under Article 51 of the UN Charter (de Hoogh Reference de Hoogh2022; Haque Reference Haque2022: 157; ICJ 1984). As briefly mentioned above, collective self-defence is usually understood as an intervention by third parties to defend a state under attack. States delivering weapons or supporting such delivery have not relied on notions of collective self-defence, but have claimed they only support Ukraine’s individual right to self-defence (UN Security Council 2023).Footnote ¹⁴

So what follows from the fact that several states display behaviour that exceeds the shared expectations found in the norm of the right to individual self-defence? What makes them go beyond the core of the norm that states have a right to self-defence? In the following section, we want to discuss the reasons for such behaviour, the effect on existing norms and the potential emergence of a new norm. Before doing so, it is important to note that our typology aims to conceptualize and understand different state behaviours rather than explain their possible effects. Nonetheless, in Part VI, we want to indicate and illustrate some of these potential effects regarding reasons for the behaviour displayed, the effect on existing norms and the potential emergence of a new norm due to specific types of behaviour.

VI. From responsible behaviour towards a responsibility to support

Actors may choose to act responsibly for a variety of reasons. They may want to signal that they are legitimate actors and part of a normative community – for example, armed non-state actors (Geis, Clément and Pfeifer Reference Geis and Hanna2021; Sienknecht Reference Sienknecht, Geis, Clément and Pfeifer2021b). Other actors may act responsibly because they are affected by developments that are stronger than others – for example, Pacific island states that are affected earlier and more strongly by the climate crisis, so may be inclined to go beyond agreed norms of climate protection (Carter Reference Carter, Klöck, Castro, Weiler and Blaxekjær2021).

In our empirical case, the very strong support for Ukraine by the Baltic states and states that were part of the former Soviet Union may be explained by their proximity to the conflict. They not only have the experience of Soviet rule, but would most likely be the first targets of attack if Russia were to expand its aggression to other states. The motivations for actors to act might be self-interested and not necessarily morally induced. While these motivations are not irrelevant, we decided to focus on the behaviour displayed by states rather than their underlying intentions, as the former affects global politics while the latter cannot be identified with certainty.Footnote ¹⁵

In terms of what follows from responsible behaviour, we assume, on an abstract level, that such behaviour may lead to norm generation, norm strengthening, an increase in the robustness of norms, norm clarification or contestation and change of norms (Ben-Josef Hirsch and Dixon Reference Ben-Josef Hirsch and Dixon2021; Deitelhoff and Zimmermann Reference Deitelhoff and Zimmermann2019; Orchard and Wiener Reference Orchard, Wiener, Orchard and Wiener2023: 14–17; Percy Reference Percy2019; Stimmer Reference Stimmer2019). In the specific case of the support of Ukraine, we identify a strengthening of existing norms, such as the right to self-defence and the prohibition of the use of force. While the prohibition of the use of force norm matters in the overall situation, states refer to Ukraine’s right to individual self-defence when it comes to justifying what we have identified here as responsible behaviour. While Ukraine is clearly the addressee of the right to individual self-defence norm, the case is not so clear-cut for supporting states. The very fact that states draw on the norm in their justifications is not only indicative of norm strengthening or normative over-fulfilment, but also indicates that states lack a specific norm on which they can draw and which stipulates to behave in such a way as they did.

Seeing that Ukraine was willing but unable to defend itself successfully has led to states supporting Ukraine with means far beyond diplomatic support. The responsible behaviour of states leads to a broader understanding of the state’s right to self-defence. This constitutes a reinterpretation of the norm. We argue that (1) the lack of a specific norm in conjunction with (2) such a reinterpretation and (3) the responsible behaviour displayed lead to a norm-generative moment in which a new norm emerges. We suggest calling that norm the responsibility to support (R2S).Footnote ¹⁶

As a norm, R2S prescribes as appropriate behaviour that supports a state in its right to self-defence in several ways, ranging from diplomatic and economic support all the way to military support as the ultima ratio. While the name of the norm indicates a close relationship with R2P, the decisive difference is that the development of R2P relates to debates about the prohibition of the use of force under Article 2(4) of the UN Charter, the norm of non-interference and the norm of sovereignty (United Nations 1945; ICISS 2001). In contrast, we argue that the R2S, which emerged as an effect of the responsible behaviour of states in the Russian war against Ukraine, has its normative roots in the norm of self-defence. This distinction matters because military intervention or support in cases where R2P is applied is not novel and may even be seen as appropriate, given that R2P in the formulation found in the 2005 World Summit Outcome Document includes the use of force under Chapter VII of the UN Charter (United Nations 2005).

Moreover, R2P and R2S differ strongly in their relation to other norms. While R2P emerged as a potential solution to solve the tension between human rights protection and sovereignty (Brock Reference Brock2013; Gholiagha Reference Gholiagha2022: 120–22), the emergence of R2S is rooted in an over-fulfilment of the norm of self-defence. Should that norm-emerging process continue, states in the future may refer to a responsibility to support as appropriate behaviour instead of justifying their support with reference to other norms or their moral or political responsibility.