Crimea was annexed by the Russian Federation in early 2014 and the peninsula, Ukrainian territory since 1954, is now administered as two Russian federal subjects—the Republic of Crimea and the federal city of Sevastopol. Until 2016 these new subjects were grouped in the Crimean Federal District. The annexation was accompanied by a military intervention by Russia in Crimea that took place in the aftermath of the 2014 Ukrainian revolution and was part of wider unrest across southern and eastern Ukraine.
On 22–23 February 2014, Russian President Vladimir Putin convened an all-night meeting with security services chiefs to discuss the extrication of deposed Ukrainian President, Viktor Yanukovych. At the end of the meeting Putin remarked that "we must start working on returning Crimea to Russia." On 23 February, pro-Russian demonstrations were held in the Crimean city of Sevastopol. On 27 February masked Russian troops without insignia took over the Supreme Council (parliament) of Crimea, and captured strategic sites across Crimea, which led to the installation of the pro-Russian Aksyonov government in Crimea, conducting the Crimean status referendum and the declaration of Crimea's independence on 16 March 2014. Russia claimed Crimea on 18 March 2014.
Ukraine and many world leaders condemned the annexation and consider it to be a violation of international law and Russian-signed agreements safeguarding territorial integrity of Ukraine, including Agreement on Establishing the Commonwealth of Independent States in 1991, Helsinki Accords, Budapest Memorandum on Security Assurances of 1994 and Treaty on friendship, cooperation and partnership between the Russian Federation and Ukraine. It led to the other members of the then G8 suspending Russia from the group, then introducing the first round of sanctions against the country. The United Nations General Assembly also rejected the vote and annexation, adopting a non-binding resolution affirming the "territorial integrity of Ukraine within its internationally recognised borders". UN resolution also "underscores that the referendum having no validity, cannot form the basis for any alteration of the status of [Crimea]" and calls upon all States and international organizations not to recognize or to imply the recognition of Russia's annexation. In 2016, UN General Assembly reaffirmed non-recognition of the annexation and condemned "the temporary occupation of part of the territory of Ukraine—the Autonomous Republic of Crimea and the city of Sevastopol".
The Russian Federation opposes the "annexation" label, with Putin defending the referendum as complying with the principle of self-determination of peoples. In July 2015, Russian prime minister Dmitry Medvedev said that Crimea had been fully integrated into Russia.
We believe that this will end one day, and Crimea will return to Ukraine.
Crimea is Ukraine!