In light of international law, the incorporation of the Crimean Peninsula (Crimea), which forms part of Ukraine’s territory, into the Russian Federation qualifies as annexation, i.e. the illegal acquisition of the territory of another state by the threat or use of force. In this respect, Crimea remains an occupied territory under international law. The annexation of Crimea by the Russian Federation has violated many treaties and fundamental principles of international law, namely the principle of territorial integrity of states, non-intervention into the domestic affairs of another state, and the prohibition of the threat or use of force against another state. Consequently, the Russian Federation has violated Ukraine’s rights which enjoy international protection. Moreover, due to the special legal status of the principles of international law that have been violated, the Russian Federation has breached its commitments under law to the entire international community. This community has an international legal obligation not to recognize the illegal situation created by the illegal use of force in the form of armed aggression, and its consequences.

Following the so-called “special military operation”, which was in fact an open aggression against Ukraine, Russia was expelled from the Council of Europe. This step has significant legal consequences, including for the jurisdiction of the European Court of Human Rights. Meanwhile, many individual applications were filed with the Court, and Ukraine brought an inter-State complaint against Russia. Ukraine has also triggered the International Court of Justice. The Court has already ordered provisional measures. The ICC Prosecutor has launched an investigation into the most serious international crimes, war crimes, crimes against humanity, and genocide in Ukraine and delivered arrest warrants against the Russian President and his Commissioner for Children’s Rights. There is a serious discussion going on concerning the establishment of a special tribunal for the crime of aggression. This text deals with some aspects of the Russian “special military operation” cases before international courts. It attempts to identify what role the international courts may play in the new phase of the conflict in Ukraine and the extent and effect of their intervention, given the jurisdictional limitations and the inability to enforce judgments.