19/12/2024 (Agence Europe) – On Thursday 19 December in Brussels, the Heads of State or Government of European Union countries celebrated the 50th anniversary of the European Council. In attendance were two of António Costa’s former predecessors at the head of the European Council: Belgium’s Herman van Rompuy and Poland’s Donald Tusk, the latter having once again become Prime Minister. The European Council became a fully-fledged EU institution under the 2007 Treaty of Lisbon. It...