DONETSK, UKRAINE - FEBRUARY 14: A rebel fighter stands guard at the entrance of the Cossack base as a Cossack officer (R) looks at the remains of a missile, as fighting continues in the area on February 14, 2015 in Donetsk, Ukraine. Missiles fired from the direction of Ukrainian positions hit a Cossack military roadblock in Donetsk, killing two Cossacks fighting on the side of Donetsk People's Republic forces and damaging civilian buildings. (Photo by Pierre Crom/Getty Images)
