Adoption of the Republic of Crimea to Russia

The Treaty on Accession of the Republic of Crimea to Russia was signed between representatives of the Republic of Crimea (including Sevastopol, with which the rest of Crimea briefly unified) and the Russian Federation on 18 March 2014 to lay out terms for the immediate admission of the Republic of Crimea and Sevastopol as federal subjects of Russia and part of the Russian Federation.

It was ratified by the Federal Assembly by 21 March.