An unidentified man waves a Ukrainian national flag as he is blocked by a bodyguard of the head of Crimea's unrecognised Russian-backed government Sergei Aksyonov, left, at a polling station in Simferopol, Ukraine, Sunday, March 16, 2014. Residents of Ukraine's Crimea region are voting in a contentious referendum on whether to split off and seek annexation by Russia. (AP Photo/Ivan Sekretarev)