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Migrants and refugees walk through snow-covered fields after crossing the Macedonian-Serbian border near the village of Miratovac on January 18, 2016. More than one million migrants reached Europe in 2015, most of them refugees fleeing war and violence in Afghanistan, Iraq and Syria, according to the United Nations refugee agency. / AFP / DIMITAR DILKOFF (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)

Migrants and refugees walk through snow-covered fields after crossing the Macedonian-Serbian border near the village of Miratovac on January 18, 2016.
More than one million migrants reached Europe in 2015, most of them refugees fleeing war and violence in Afghanistan, Iraq and Syria, according to the United Nations refugee agency. / AFP / DIMITAR DILKOFF        (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)