The International Criminal Court (ICC) is established to combat impunity for international crimes, as outlined in the Rome Statute. Ukraine’s President, Volodymyr Zelensky, emphasized the punishment of evil in his speech to the US Congress. Since February 24, 2022, Russia has been threatening Ukraine, allegedly committing war crimes. The article will focus on the illegality of war crimes and their legislation before courts, rather than the qualification of the crime of aggression under international law or Russia’s involvement. The definition of war crimes and their entailment are essential for international and national criminal justice responses to these violations.