since 1992. It commemorates the adoption of the Declaration of State Sovereignty of the Russian Soviet Federative Socialist Republic (RSFSR) on June 12, 1990.The name Russia is derived from Rus’, a medieval state populated mostly by the East Slavs. However, this proper name became more prominent in the later history, and the country typically was called by its inhabitants “Русская Земля” (russkaja zemlja), which can be translated as “Russian Land” or “Land of Rus'”.Orthodox Christianity is the dominant religion of the country, and, besides it, Old Believers and Lutheranism also have had a considerable role in the multiethnic history of Russia. Evangelicalism and Catholicism (among Russians) are relatively recent additions to Christianity in Russia, country that stretches over a vast expanse of eastern Europe and northern Asia. Once the preeminent republic of the Union of Soviet Socialist Republics (U.S.S.R.; commonly known as the Soviet Union), Russia became an independent country after the dissolution of the Soviet Union in December 1991.