European Commission President Jean-Claude Juncker speaks during a press conference with Serbian President Aleksandar Vucic (not seen in the picture) in Belgrade, Serbia on Feb. 26, 2018. The European Union is "keen" to receive Serbia and other Western Balkans countries as members when they meet preconditions, Juncker told Serbian president Aleksandar Vucic on Monday. (Xinhua/Predrag Milosavljevic)