USSR
On December 30, 1922 RSFSR together with the Ukraine (UkSSR) and Byelorussia (BSSR) as well as Transcaucasia republics formed the Union of Soviet Socialist Republics (the USSR).
On December 30, 1922 RSFSR together with the Ukraine (UkSSR) and Byelorussia (BSSR) as well as Transcaucasia republics formed the Union of Soviet Socialist Republics (the USSR).