Greek Prime Minister Kyriakos Mitsotakis (C) walks along the German Ambassador to Greece Ernst Reichel (L) and the Greek Alternate Minister of Migration and Asylum Giorgos Koumoutsakos in Athens, Greece, on April 18, 2020. (Xinhua/Marios Lolos)

A group of refugee children from the reception camps of the Aegean islands board an airplane to Germany, in Athens, Greece, on April 18, 2020. (Xinhua/Marios Lolos)

A group of refugee children from the reception camps of the Aegean islands leave a shuttle bus to board an airplane to Germany, in Athens, Greece, on April 18, 2020. (Xinhua/Marios Lolos)