Turkish President Recep Tayyip Erdogan will visit Brussels on Monday for talks with European Union officials amid a standoff between Ankara and Brussels over sharing of responsibility for refugees and other migrants.
Thousands of migrants have massed at Turkey's land border with EU-member Greece after Erdogan's government made good on a long-standing threat and announced it would no longer prevent migrants from crossing into EU countries.
Turkey hosts more than 3.5 million Syrian refugees, and Erdogan has demanded that Europe shoulder more of the burden of caring for them.