Council of Europe Seminar on the Special Tribunal: A seminar on “The Special Tribunal for the Crime of Aggression against Ukraine: What Role for Regional Organisations such as the Council of Europe?” was held on 10 April 2024 in Strasbourg on the margins of the 66th meeting of the Council of Europe’s Committee of Legal Advisers on Public International Law (CAHDI). This reflects the current focus of the discussions on using a regional organisation like the Council of Europe to ensure accountability for the fundamental assault by the Russian leadership in the situation in Ukraine. Three members of GIPA’s Council of Advisers spoke at the meeting: Claus Kreß (keynote), Dapo Akande and Astrid Reisinger Coracini.