Belbek air base commander Col. Yuliy Mamchur, center, reacts to a request to leave the base by a leader of Crimea's self defense units, right, who declined to be identified, near the main gate of the base, outside Sevastopol, Crimea, Friday, March 21, 2014. Mamchur said he was asked by the Russian military to turn over the base but is unwilling to do so until he receives orders from the Ukrainian defense ministry. (AP Photo/Vadim Ghirda) ( Crimea )