Serbian President Aleksandar Vucic (R) speaks with European Commission President Jean-Claude Juncker (C) and EU Commissioner for European Neighborhood Policy and Enlargement Negotiations Johannes Hahn 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)