Crimea in the Soviet Union followed by Crimean Oblast
Crimea within the Ukrainian SSR (1954–1992)
Crimean Oblast of the Ukrainian SSR (1954–1991)
On 19 February 1954, the oblast was transferred from the Russian SFSR to the Ukrainian SSR jurisdiction, on the basis of "the integral character of the economy, the territorial proximity and the close economic and cultural ties between the Crimea Province and the Ukrainian SSR" and to commemorate the 300th anniversary of Ukraine's union with Russia.Sevastopol was a closed city due to its importance as the port of the Soviet Black Sea Fleet and was attached to the Crimean Oblast only in 1978.