On March 29, 2018, the Government of the Co-operative Republic of Guyana (hereinafter Guyana) filed in the Registry of the Court an application instituting proceedings against the Bolivarian Republic of Venezuela (hereinafter Venezuela) with respect to a dispute concerning “the legal validity and binding effect of the Award regarding the Boundary between the Colony of British Guiana and the United States of Venezuela, of 3 October 1899” (hereinafter the 1899 Award or the Award).

On June 19, 2023, the Intergovernmental Conference on an international legally binding instrument under the United Nations Convention on the Law of the Sea on the conservation and sustainable use of marine biological diversity of areas beyond national jurisdiction (BBNJ Intergovernmental Conference) adopted, by consensus, the Agreement under the United Nations Convention on the Law of the Sea on the Conservation and Sustainable Use of Marine BioLogical Diversity of Areas Beyond National Jurisdiction (BBNJ Agreement or Agreement). The Agreement, which is grounded in and builds on the UN Convention on the Law of the Sea (UNCLOS), specifically addresses issues relating to the conservation and sustainable use of the marine biodiversity of the high seas. The adoption of the Agreement was the culmination of nearly two decades of work under the auspices of the UN General Assembly.

Following a debate at the Parliamentary Assembly of the Council of Europe (PACE) on January 26, 2023 (7th sitting), under the urgent procedure, a text was adopted by 100 votes in favour, none against, and one abstention: a Resolution on the “Legal and human rights aspects of the Russian Federation's aggression against Ukraine.”

Over the course of the period from the end of 2022 to early 2023, requests for advisory opinions on climate change were, for the first time, made to the International Court of Justice (ICJ), the International Tribunal for the Law of the Sea (ITLOS), and the Inter-American Court of Human Rights (IACtHR).

On July 6, 2023, the Court of Justice of the European Union (CJEU) delivered its judgment in C-663/21 AA on a preliminary reference from the Austrian Supreme Administrative Court. The CJEU examined the international legal principle of non-refoulement and how it applies in EU law, particularly to expulsion decisions following the withdrawal of refugee status. It held that EU law “preclude[es] the adoption of a return decision in respect of a third-country national where it is established that removal of that third-country national to the intended country of destination is, by reason of the principle of non-refoulement, precluded for an indefinite period.”

Under Article 41 of the UN Charter, the Security Council has established 31 sanctions regimes since 1966. Sanctions measures encompass a broad range of enforcement actions not involving the use of armed force. The measures have ranged from comprehensive economic and trade sanctions to more targeted measures such as arms embargoes, travel bans, and financial or commodity restrictions. In recent years, there have been increasing numbers of complaints from humanitarian organizations that sanctions cause or exacerbate humanitarian crises. The UN Office for the Coordination of Humanitarian Affairs (OCHA) has estimated that at least 222 million people were experiencing acute food insecurity at the end of 2022, the largest global food crisis in modern history. At the same time, the countries that need the most assistance are often subject to international sanctions regimes. As of March 2023, UN sanctions applied in nine of the top ten operations of the International Committee of the Red Cross.

The United Nations General Assembly adopted the United Nations Convention on the International Effects of Judicial Sales of Ships at its 47th plenary meeting on December 7, 2022 (the Convention). Known as the “Beijing Convention on the Judicial Sale of Ships,” the Convention opened for signature at a ceremony held in Beijing, PRC, on September 5, 2023. By its terms, the Convention will enter into force 180 days after the date that it is ratified, accepted, approved, or otherwise acceded to by at least three states. With strong backing from the maritime community, it is expected that the Convention will enter into force by 2024.

This case addressed irregularities in the investigation of the death of Digna Ochoa y Plácido on October 19, 2001. The petition alleged that her death occurred in the context of harassment and attacks against human rights defenders in Mexico. The Inter-American Commission of Human Rights (the Commission) found that the state was responsible for violations of rights related to judicial protection and judicial guarantees under Articles 8(1) and 25 and personal integrity under Article 5 of the American Convention on Human Rights (ACHR).

Congress recently enacted significant reforms to the laws governing the reporting and publication of international agreements in the United States. These reforms were adopted in December 2022 and took effect in September 2023, and the State Department issued regulations implementing them in early October 2023.

In two cases decided on October 18, 2022, the European Court of Human Rights issued judgments for the first time in complaints alleging racial profiling in police identity checks. The applicants in both cases alleged that the police had selected them for a check due to racial discrimination, and both argued that the state had failed to conduct an effective investigation in response to their complaints. In one case, a unanimous court found a violation of the European Convention on Human Rights, but in the other case, a sharply divided court decided 4–3 that there was no violation. The cases raise serious questions about proof and evidence in racial profiling cases, as well as what policies and procedures would meet the state obligation to ensure an adequate legal framework to protect against racial discrimination.

Yegiazaryan v. Smagin represents a landmark case within the Supreme Court's (SCOTUS) jurisdiction, revolving around a contractual dispute between John Yegiazaryan and Alex Smagin. The legal intricacies unfolded when Smagin sought to enforce a multimillion-dollar arbitration award against Yegiazaryan in California under the New York Convention. The district court's asset freeze faced complications as Yegiazaryan, residing in California, received an unrelated arbitration award and attempted to evade the freeze. In response, Smagin invoked the Racketeer Influenced and Corrupt Organizations Act (RICO), alleging a coordinated effort to obstruct the collection of the arbitration judgment. The case stands as a pivotal legal milestone marked by complexities and jurisdictional challenges.

On November 16, 2023, the International Court of Justice voted 13 – 2 in favor of issuing a binding Order in the case of Canada and the Netherlands v. Syrian Arab Republic. The Order adopted two provisional measures, which require Syria to prevent acts of torture and other cruel punishment, ensure that its officials and organizations do not commit torture or other cruel punishments, and preserve any evidence related to the allegations of the case. A Request for the Indication of Provisional Measures seeking such an order had been entered on June 8, 2023, by Canada and the Netherlands, for which oral arguments were held on October 10, 2023. The Request came alongside Canada's and the Netherlands' Joint Application instituting proceedings against Syria for violations of the Convention against Torture and Other Cruel, Inhuman or Degrading Treatment or Punishment. The Request and Application were made pursuant to Articles 36 and 41 of the Statute of the Court, Article 30 of the Convention against Torture, and Articles 73, 74, and 75 of the Rules of the Court. Vice-President Gevorgian and Judge Xue voted against both provisional measures, with Vice-President Gevorgian appending a dissenting opinion and Judge Xue appending a declaration.

On September 1, 2023, the Standing Committee of the National People's Congress promulgated the Foreign State Immunity Law of the People's Republic of China (FSIL), which entered into force on January 1, 2024. The law abandons China's prior adherence to the absolute theory of state immunity and instead adopts the restrictive theory followed by most other countries. Under the restrictive theory, foreign states are immune from suits based on their governmental acts (acta jure imperii) but are subject to suits based on their non-governmental acts (acta jure gestionis).

The European Court of Human Rights (ECtHR) handed down a unanimous decision on November 23, 2023, in a case brought by former Polish President Lech Walesa against the Polish Government. The Court concluded that a Polish Appeals Court, the Chamber of Extraordinary Review and Public Affairs (CERPA), had violated Walesa's right to an independent and impartial trial, breached “the principle of legal certainty,” and violated his right to respect for private and family life. The Court found that the CERPA “was not an ‘independent and impartial tribunal established by law’” and was often used by the state to “further its own political opinions and motives,” as the Prosecutor General of Poland and the Executive branch of government held considerable influence and authority over the judicial system. Additionally, the 2017 law that created the CERPA gave to the General Prosecutor “the unlimited power to contest virtually any final judicial decision” and extended the time limits for filing appeals, which enabled the Prosecutor to act retroactively and undermine the “requirement of foreseeability.”