EU-Western Balkans summit held in Sofia, Bulgaria

Serbia's President Aleksander Vusic, Bulgarian Prime Minister Boyko Borissov, European Commission President Jean-Claude Juncker and European Council President Donald Tusk (from L to R) pose for photos before a press conference in Sofia, Bulgaria, May 17, 2018. The EU-Western Balkans summit was held in Sofia on Thursday. (Xinhua/Wang Xinshan)