Greek Prime Minister Kyriakos Mitsotakis (L) shakes hands with President of the European Council Donald Tusk during their meeting in Athens, Greece, on Oct. 9, 2019. (Xinhua/Marios Lolos)

Greek Prime Minister Kyriakos Mitsotakis (L) welcomes President of the European Council Donald Tusk in Athens, Greece, on Oct. 9, 2019. (Xinhua/Marios Lolos)

Greek Prime Minister Kyriakos Mitsotakis (1st R) meets with President of the European Council Donald Tusk (1st L) in Athens, Greece, on Oct. 9, 2019. (Xinhua/Marios Lolos)