
More than three years after Russia's initial invasion of Ukraine in 2014, and over two years since the full-scale invasion began in February 2022, the pursuit of justice for the crime of aggression remains a central, yet challenging, goal for Ukraine. While the International Criminal Court (ICC) has issued arrest warrants for Russian officials concerning war crimes, it lacks jurisdiction over the crime of aggression in this specific conflict. This limitation has spurred Ukraine to advocate for a special international tribunal to prosecute Russia's leadership for initiating and waging the war, but the path toward establishing such a tribunal is fraught with legal and political obstacles.
The primary impetus for establishing a special tribunal stems from the ICC's jurisdictional limitations. The ICC's Rome Statute, which governs its operation, stipulates that the court can only investigate the crime of aggression if both the aggressor and the victim states have ratified the statute, which neither Russia nor Ukraine has done. While the ICC can prosecute war crimes, crimes against humanity, and genocide allegedly committed by Russian forces in Ukraine, it cannot address the overarching crime of aggression – the act of initiating an illegal war.
Ukrainian authorities have documented over 140,000 alleged war crimes committed by Russian forces since the full-scale invasion began. The ICC has issued six warrants against high-ranking Russian officials, including one against President Vladimir Putin, for the deportation of Ukrainian children. However, holding Putin and his inner circle accountable for the act of aggression itself requires a different legal mechanism.
Despite widespread international condemnation of Russia's actions, establishing a special tribunal faces significant hurdles. These challenges include:
Several models for establishing a special tribunal have been proposed, each with its own advantages and disadvantages:
Ukraine is reportedly considering two models for the tribunal, emphasizing the importance of an international profile to underscore that the court would address a crime against the entire global community, not just a conflict between two states.
The establishment of a special tribunal would have far-reaching implications. It would send a strong message that aggression is unacceptable and that those who initiate illegal wars will be held accountable. It would also provide a measure of justice for the victims of the war in Ukraine and contribute to the restoration of international order.
However, the challenges are significant, and progress has been slow. As of early 2025, despite unanimous support from the Parliamentary Assembly of the Council of Europe, the tribunal has not begun its work, with experts suggesting little progress is likely this year. A key sticking point remains the hesitation of some of Ukraine's Western partners regarding the prosecution of Vladimir Putin himself.
To move forward, Ukraine needs to continue to build international support for the tribunal, address the legal challenges related to immunity and jurisdiction, and work with its partners to develop a viable and effective legal model. The creation of such a tribunal would add to Russia's diplomatic isolation and make a return to "business as usual" more difficult.
The pursuit of a special tribunal to prosecute Russia's war of aggression in Ukraine is a complex and challenging undertaking. While the obstacles are significant, the potential benefits in terms of justice, accountability, and deterrence are substantial. The establishment of such a tribunal would not only hold Russian leaders accountable for their actions but also send a powerful message that aggression will not go unpunished in the 21st century. The lack of political will remains the decisive factor, and Ukraine's continued efforts to galvanize international support will be crucial in overcoming the remaining hurdles.

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