The internationally recognised Ukrainian territory of Crimea was annexed by the Russian Federation on 18 March 2014. From the time of the annexation, Russia has de facto administered the peninsula as two federal subjects—the Republic of Crimea and the city of Sevastopol—within the Crimean Federal District. The military intervention and annexation by Russia took place in the aftermath of the Ukrainian Revolution but was pre-planned rather than a response to events. It was also part of wider unrest across southern and eastern Ukraine. Masked Russian troops without insignias took over the Supreme Council of Crimea, and captured strategic sites across Crimea, which led to the installation of the pro-Russian Aksyonov government in Crimea, the holding of a disputed, unconstitutional referendum and the declaration of Crimea's independence.