Refugees and migrants stranded in northern Greece have vowed to keep trying to cross into Macedonia. About 13,000 people are stranded near the border village of Idomeni, and at least 34,000 people are trapped in various parts of Greece, thanks to a cascade of border closures further north, blocking the 'Balkans corridor'. At a recent summit, the EU and Turkey outlined a tentative deal to return thousands of migrants to Turkey.