FILE - Serbia Defense Minister Aleksandar Vulin, right, walks behind Serbian President Aleksandar Vucic in Belgrade, Serbia, Monday, April 23, 2018. Vulin, said Monday, July 11, 2022 he is advocating a “Serbian world” that would unite all Serbs in the Balkans in a single state, rejecting a U.S. warning that such calls could further fuel tensions in the still volatile region. (AP Photo/Darko Vojinovic, File)