The status of Crimea is disputed. It is claimed by Ukraine and recognized as Ukrainian by the United Nations and most other countries, but it is governed by Russia. In February 2014, following the 2014 Ukrainian revolution that ousted the Ukrainian President, Viktor Yanukovych, Russia annexed Crimea after a military intervention by pro-Russian separatists and Russian Armed Forces. A controversial Crimea-wide referendum, illegal under the Ukrainian and Crimean constitutions, was held on the issue of reunification with Russia; its official results showed over 90% support for reunification; however, the vote was boycotted by many loyal to Ukraine and declared illegitimate by Western governments and the United Nations. Russia formally annexed Crimea on 18 March 2014, incorporating the Republic of Crimea and the federal city of Sevastopol as the 84th and 85th federal subjects of Russia.