Ukrainian government soldiers sit on top of their armored vehicle driving on a road stretching away from the town of Artemivsk, Ukraine, towards Debaltseve, Tuesday, Feb. 17, 2015. Ukrainian government troops and Russia-backed rebels failed Tuesday to start pulling back heavy weaponry from the front line in eastern Ukraine as a deadline passed to do so. Under a cease-fire agreement negotiated by the leaders of Ukraine, Russia, Germany and France last week, the warring sides were to begin withdrawing heavy weapons from the front line on Tuesday. (AP Photo/Petr David Josek)