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TOPSHOT - A boy stands among tents during a foggy morning at a makeshift camp at the Greek-Macedonian border near the Greek village of Idomeni on March 8, 2016, where thousands of refugees and migrants are trapped by the Balkan border blockade. European Union leaders on Monday hailed a "breakthrough" in talks with Turkey on a deal to curb the migrant crisis but delayed a decision until a summit next week to flesh out the details of Ankara's new demands. / AFP / DIMITAR DILKOFF (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)

TOPSHOT - A boy stands among tents during a foggy morning at a makeshift camp at the Greek-Macedonian border near the Greek village of Idomeni on March 8, 2016, where thousands of refugees and migrants are trapped by the Balkan border blockade. 
European Union leaders on Monday hailed a "breakthrough" in talks with Turkey on a deal to curb the migrant crisis but delayed a decision until a summit next week to flesh out the details of Ankara's new demands. / AFP / DIMITAR DILKOFF        (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)