epa05070198 A group of refugees and migrants are towed in a dinghy by a coast guard patrol boat, following a successful rescue operation, on the Greek island of Lesbos (Lesvos), Greece, 15 December 2015, after crossing the Aegean Sea from Turkey. Around 800,000 migrants and refugees are estimated to have arrived in Greece since the beginning of the year, with most moving on - sometimes unhindered - to wealthy northern European countries. EPA/STRINGER