Legal Challenges in Prosecuting the Crime of Aggression in the Russo-Ukrainian War

The Russian invasion of Ukraine has opened a debate over how to ensure accountability for the supreme international crime, namely the crime of aggression. Prosecuting the crime of aggression related to Russia's attack on Ukraine is hampered by the fact that neither country, Russia nor Ukraine, are Member States of the Rome Statute, which established the International Criminal Court (icc) and transferred the crime to its jurisdiction. As a result, this article will examine how and in what ways the crime of aggression may be prosecuted in the context of the Russo-Ukrainian war, with a particular emphasis on prosecuting the crime through the icc, domestic courts, or by establishing an ad hoc tribunal. Based on an analysis of the legal aspects of prosecuting the crime of aggression, the article suggests that currently, the most appropriate approach to prosecuting the crime in the context of the Russo-Ukrainian war is to establish an international ad hoc tribunal, either through a treaty signed by the United Nations and Ukraine on the basis of a referral from the United Nations General Assembly and the United Nations Secretary-General or a multilateral treaty between Ukraine and other states supported by the United Nations.