Reuters / Monday, January 18, 2016 A migrant walks through a frozen field after crossing the border from Macedonia, near the village of Miratovac, Serbia, January 18, 2016. REUTERS/Marko Djurica

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Reuters / Monday, January 18, 2016 A migrant walks through a frozen field after crossing the border from Macedonia, near the village of Miratovac, Serbia, January 18, 2016. REUTERS/Marko Djurica

A woman holds a young child as migrants and refugees take shelter near the western Serbian village of Berkasovo, near the Serbia-Croatia border on October 19, 2015 (AFP Photo/Andrej Isakovic)

The graves of a Syrian Christian Orthodox family who drowned at sea during an attempt to cross a part of the Aegean Sea from the Turkish coast, are seen at the Saint Panteleimon cemetery of Mytilene, on the Greek island of Lesbos, October 7, 2015. Reuter

A young migrant, who drowned in a failed attempt to sail to the Greek island of Kos, lies on the shore in the Turkish coastal town of Bodrum. REUTERS/Nilufer Demir/DHA

Migrants hold hands as they try to enter Macedonia near Gevgelija at the border with Greece September 2, 2015. Reuters/Ognen Teofilovski

Children stand among seats in a train with migrants on board, en route from Budapest to Vienna, Austria, August 31, 2015. REUTERS/LASZLO BALOGH