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This contribution highlights the importance of a proactive approach to enhancing the capacity of national jurisdictions to prosecute Rome Statute crimes, an approach which may be named ‘proactive complementarity’. Such an approach facilitates a constructive interplay between national and international jurisdictions. Many players have a responsibility to assist in this process, which is traditionally at the heart of bilateral and multilateral donor activity. The International Criminal Court, with its strictly judicial mandate, can only have a small, lateral role in building national capacities. Nevertheless, each organ of the International Criminal Court can play a role. This chapter sets out a number of creative initiatives that the Registry of the Court can undertake to boost national capacity, focusing on the core Registry competence of organizing and running fair trials.
The principle of complementarity is fundamental to the architecture of the Rome Statute of the International Criminal Court (ICC), and reflects a balance between national sovereignty and the interests of the international community in combating impunity for international crimes. The primacy of national over international jurisdictions has a long history and is one of the cornerstones of state sovereignty. Many of the international conventions that form a basis for international justice, such as the Genocide Convention or the Geneva Conventions, place duties on states and empower them to assert jurisdiction over breaches. Of course, the ad hoc tribunals created by the Security Council were exceptions to this general trend, but they were geographically and time bound, and such primacy was interpreted narrowly by many members of the Security Council. The complementarity regime of the ICC ensured that the many states that wanted to re-affirm the principle of national sovereignty and the corollary primacy of national proceedings would yet be willing to accept the creation of an international jurisdiction to try international crimes under certain conditions.