FILE - In this Sunday, July 19, 2015, file photo, Syrian refugee girl Zubaida Faisal, 10, skips a rope while she and other children play near their tents at an informal tented settlement near the Syrian border on the outskirts of Mafraq, Jordan. Russia has announced the establishment of safe corridors to allow civilians to leave Ukrainian towns and cities under siege. But there appeared to be few takers. The tactic of siege combined with humanitarian corridors was often used in Syria after Moscow entered the war in 2015 to shore up President Bashar Assad’s forces. (AP Photo/Muhammed Muheisen, File)