The territory of Crimea was conquered and controlled many times throughout its history. The Cimmerians, Greeks, Scythians, Goths, Huns, Bulgars, Khazars, the state of Kievan Rus', Byzantine Greeks, Kipchaks, Ottoman Turks, Golden Horde Tatars and the Mongols all controlled Crimea in its earlier history. In the 13th century, it was partly controlled by the Venetians and by the Genovese; they were followed by the Crimean Khanate and the Ottoman Empire in the 15th to 18th centuries,
the Russian Empire in the 18th to 20th centuries, Germany during World War II and the Russian Soviet Federative Socialist Republic and later the Ukrainian Soviet Socialist Republic, within the Soviet Union during the rest of the 20th century.
http://en.wikipedia.org/wiki/Crimea