On the 20th of September 2023 the informative session was held on “The Crimes of Aggression before the ICC”. The lecture was given by Professor Patrycja Grzebyk (Associate Professor at the University of Warsaw), a specialist in the area of international criminal law and author of the monograph “Criminal Responsibility for the Crime of Aggression” (Routledge 2013). During the presentation she referred to several questions and problems: Why is it so difficult to initiate ICC jurisdiction over a crime of aggression? What does the UN Security Council have to do with it? Who can be held accountable for the crime of aggression? What is the relationship between the crime of aggression and other international crimes under the Rome Statute? The meeting was moderated by Professor Hanna Kuczyńska and was a joint event of the Project Sunflowers and the EU Project Pravo-Justice.