You will find 20-7 member states who definitely have conferred powers upon the EU institutions (other nations around the world are tied to the EU in other ways). In Trade for conferring competences, EU states are assigned votes during the Council, seats in Parliament in addition to a European Commissioner https://stephenafkpu.activablog.com/27010264/icc-seeking-arrest-warrants-for-hamas-leaders-and-israel-s-netanyahu