The Turkish Coast Guard has stepped up nighttime patrols on the choppy, wintry waters of the Aegean Sea, seizing rafts full of refugees fleeing war for Europe and sending them back to Turkey . Down south, at the border with Syria , Turkey is building a concrete wall, digging trenches, laying razor wire and at night illuminating vast stretches of land in an effort to cut off the flow of supplies and foreign fighters to the Islamic State. On land and at sea, Turkey’s borders, long a revolving door of refugees, foreign fighters and the smugglers who enable them, are at the center of two separate yet interlinked global […]