The WP's Adam Taylor gives readers glimpses of Ukraine's and Crimea's history. The Crimea was at various times part of the Greek and Roman Empires as Taurica, the Mongols, the Khanate since 1400, and part of the Russian Empire since 1783. About 60% of the population is Russian in the Crimea, 12% Tartars. Under the Soviet Union it was first the Crimean Autonomous Socialist Republic till 1945 and then Crimean Oblast, an administrative region of Russia. It was made part of Ukraine by Russian premier Krushchev in 1954, Krushchev himself being a Russian who came up through the Ukrainian Communist party. In Dec. 1991 a referendum was held in Ukraine, 54% of Crimean voters favored independence from Russia. Crimea remained part of Ukraine with autonomy including its own constitution, and legislature. A 1997 treaty allowed Russia to base its Black Sea fleet in Sevastopol, Crimea.