Greek Prime Minister Alexis Tsipras (R, Front) shakes hands with former Foreign Minister Nikos Kotzias at the handover ceremony in Athens, Greece, on Oct. 20, 2018. Alexis Tsipras was sworn in as Greece's Foreign Minister before Greek President Prokopis Pavlopoulos on Saturday, officially taking over the helm of the ministry from Nikos Kotzias, who resigned on Wednesday. (Xinhua/Giorgos Kontarinis)?