Photo taken on March 14, 2014 shows the street view of Simferopol, capital of Ukraine's Autonomous Republic of Crimea. Crimea will hold a referendum over its future status on Sunday. (Xinhua/Sadat)

People walk by the parliament building in Simferopol, capital of Ukraine's Autonomous Republic of Crimea, March 14, 2014. Crimea will hold a referendum over its future status on Sunday. (Xinhua/Sadat)

Two men play musical instruments near the parliament building in Simferopol, capital of Ukraine's Autonomous Republic of Crimea, March 14, 2014. Crimea will hold a referendum over its future status on Sunday. (Xinhua/Sadat)

People walk by the parliament building in Simferopol, capital of Ukraine's Autonomous Republic of Crimea, March 14, 2014. Crimea will hold a referendum over its future status on Sunday. (Xinhua/Sadat)

People participate in a pro-Russia rally in Simferopol, capital of Ukraine's Autonomous Republic of Crimea, March 14, 2014. Crimea will hold a referendum over its future status on Sunday. (Xinhua/Sadat)