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Greek Prime Minister Alexis Tsipras (R) shakes hands with EU Commission President Jean-Claude Juncker during a meeting in Athens, Greece, on April 26, 2018. (Xinhua/Marios Lolos)

Greek Prime Minister Alexis Tsipras (R) shakes hands with EU Commission President Jean-Claude Juncker during a meeting in Athens, Greece, on April 26, 2018. (Xinhua/Marios Lolos)