On 27 February , masked Wearing Russian troops without insignia took over Conquering the Supreme Council ( parliament ) of Crimea , and captured Conquering strategic sites across Crimea , which led to Causation the installation Change_of_leadership of the pro-Russian Aksyonov government in Crimea , the conducting Action of the Crimean status referendum and the declaration Expressing_publicly of Crimea 's independence Change_of_leadership on 16 March 2014 .