The Latest on the migrant crisis in Europe (all times local):

9:30 a.m.

Turkish Prime Minister Ahmet Davutoglu says the refugee emergency is not something to be bargained over, as the European Union looks to send back tens of thousands of migrants to Turkey.

Davutoglu said on Friday that "for Turkey, the refugee issue is not an issue of bargaining, but an issue of values."

He spoke as he arrived for talks with EU leaders. Europe is looking to outsource to Turkey a refugee emergency that has divided the 28-nation bloc.

Turkey will take back all irregular migrants newly arriving in Greece. For every Syrian among them, the EU will welcome in one Syrian refugee from Turkey. Ankara will also receive billions of euros in aid, visa-free travel for Turks and faster EU membership talks.

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9:10 a.m.

U.N. chief Ban Ki-moon says building barriers won't solve the migrant crisis in Europe.

The United Nations secretary-general told German daily Bild in an interview published Friday that "building walls, discriminating against people or sending them back is no answer to the problem."

Ban praised German Chancellor Angela Merkel's "human political leadership" in dealing with the migrant crisis and urged other politicians to follow her example.

He declined to comment on speculation that Merkel might be nominated to succeed him in the top U.N. role when his second term ends on Dec. 31.