Greek Prime Minister Alexis Tsipras (R, Front) and Greek President Prokopis Pavlopoulos (L, Front) are seen at the presidential office 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)?