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Croatian Prime Minister Andrej Plenkovic (R) shakes hands with visiting Serbian President Aleksandar Vucic in Zagreb, Croatia, on Feb. 12, 2018. (Xinhua/Patrik Macek)

Croatian Prime Minister Andrej Plenkovic (R) shakes hands with visiting Serbian President Aleksandar Vucic in Zagreb, Croatia, on Feb. 12, 2018. (Xinhua/Patrik Macek)