BRUSSELS, June 29, 2016 (Xinhua) -- European Council President Donald Tusk (C), European Commission President Jean-Claude Juncker (R) and Dutch Prime Minister Mark Rutte attend a press conference at the EU headquarters in Brussels, Belgium, June 28, 2016. European leaders on Tuesday pressed for a quick and clear British departure plan to quell worldwide anxiety about the continent's future. (Xinhua/Gong Bing)