In this Nov. 17, 2017, photo, Serbia's President Aleksandar Vucic, right, reviews an honor guard with his Defense Minister Aleksandar Vulin during a bilateral Serbian and U.S. airborne exercise at Lisicji jarak airport, some 15 kilometers (10 miles) north of Belgrade, Serbia. A U.S. envoy urged Serbia and Kosovo on Friday, March 8, 2019 to stop mutual provocations and resume dialogue amid rising tensions between the two wartime foes. (AP Photo/Darko Vojinovic)
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