The number of migrants crossing the Aegean Sea from Turkey to EU territory remains "far too high", EU President Donald Tusk said after talks with Prime Minister Ahmet Davutoglu in Ankara on Thursday.

"We agree the refugee flows still remain far too high and that further action is needed," Tusk said, while praising Turkey for its growing cooperation including stepped-up coastguard patrols and a tightening of its visa regime.