Armed men, believed to be Russian servicemen, stand guard outside a Ukrainian military base in Perevalnoye, near the Crimean city of Simferopol, March 19, 2014. Three Russian flags were flying at an entrance to Ukraine's naval headquarters in the Crimean port of Sevastopol on Wednesday, witnesses said, as pro-Russian forces took control of at least some of the base without armed resistance. (Photo by Shamil Zhumatov/Reuters)
