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Greek Prime Minister Kyriakos Mitsotakis (L) welcomes visiting Serbian President Aleksandar Vucic at the Prime Minister's Office in Athens, Greece, on Dec. 11, 2019. (Xinhua/Marios Lolos)

Greek Prime Minister Kyriakos Mitsotakis (L) welcomes visiting Serbian President Aleksandar Vucic at the Prime Minister's Office in Athens, Greece, on Dec. 11, 2019. (Xinhua/Marios Lolos)