Jean-Claude Juncker, President of the European Commission (first from right), Donald Tusk, President of the European Council (second from right), Boiko Borissov, Prime Minister of Bulgaria (second from left) and Tayyip Erdogan, President of Turkey, at the EU-Turkey Leaders events in Varna, Bulgaria. Date: 26/03/2018. © European Union, 2018 / Source: EC - Audiovisual Service.