We are examining the Institute of Cooperation between international criminal courts and states. By analyzing international legal doctrine, we have identified the main stages of development in international criminal justice. The influence of the humanist values of the 19th century and various pragmatic views and principles of international criminal law norms evolved as part of the international legal system, introducing prohibitions on certain criminal activities, including war crimes, crimes against humanity, and genocide, is shown.The Nuremberg and Tokyo International Military Tribunals were considered crucial benchmarks in the evolution of international criminal law. The International Military Tribunal for the Trial of Major War Criminals of European Countries has until now been created, as follows from Article 1 of the London Agreement, to try war criminals whose crimes are not connected to a specific geographical location, regardless of whether they are prosecuted individually or as members of organizations or groups, or in one or another capacity. It is shown that both Tribunals were historically necessary to carry out retribution for mass crimes committed by high-ranking military and civilian officials of Nazi Germany and Japan during World War II. It was noted that both Tribunals were subjected to fair criticism - both from the participants and later - for the legal imperfection of their institutional basis, selective administration of justice, and the retroactive effect of some essential material norms of criminal law.It was analyzed that the institution of cooperation was revealed in detail in the activities of the International Criminal Tribunal for the former Yugoslavia (from now on - ICTY) and the International Criminal Tribunal for Rwanda (from now on - ICTR). Thus, the ICTY and ICTR were created based on resolutions of the Security Council, which, acting in accordance with Chapter VII of the UN Charter, decided that states should fully cooperate with these bodies of international criminal justice.The Department of Private International Law is shown as one of the divisions of the International Court of Justice, which, among other things, “resolves extremely important and nowadays most relevant extradition disputes and tries political criminals and anarchists. It was emphasized that the court should be independent, both from the parties whose case it decides and from any political movements and opinions in general.
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