Belgium has officially announced its decision to join the Special Tribunal for the Crime of Aggression against Ukraine, becoming the 24th state to support the international initiative aimed at prosecuting Russia’s top political and military leadership over the invasion of Ukraine.
The announcement was confirmed on Thursday by Belgium’s Ministry of Foreign Affairs, which reaffirmed Brussels’ commitment to international justice and accountability for crimes committed during Russia’s war against Ukraine.
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Ukrainian officials welcomed the decision, calling it another important step toward establishing accountability for Russian aggression.
“Justice is essential for a comprehensive and lasting peace,” Ukrainian Foreign Minister Andrii Sybiha wrote on X, thanking Belgium for its “principled support and solidarity.”
The Special Tribunal was created to address a legal gap left by the International Criminal Court (ICC), which currently lacks jurisdiction to prosecute the specific crime of aggression in the context of Russia’s war against Ukraine without a UN Security Council mandate.
Established within the framework of the Council of Europe, the tribunal is intended to investigate and prosecute senior Russian political and military leaders responsible for planning and launching the invasion.
A bilateral agreement between Ukraine and the Council of Europe establishing the tribunal was signed in June 2025. Since then, European governments and institutions have accelerated efforts to make the mechanism fully operational.
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