Ukrainian Soviet Socialist Republic
Eventually, after the creation of the Communist Party (Bolshevik) of Ukraine in Moscow, a third Ukrainian Soviet government was formed on 21 December 1919 that initiated new hostilities against Ukrainian nationalists as they lost their military support from the defeated Central Powers. Eventually, the Red Army ended up controlling much of the Ukrainian territory after the Polish-Soviet Peace of Riga. On 30 December 1922, along with the Russian, Byelorussian, and Transcaucasian republics, the Ukrainian SSR was one of the founding members of the Union of Soviet Socialist Republics (USSR).
Byelorussian Soviet Socialist Republic
On the international stage, Byelorussia (along with Ukraine) was one of only two republics to be separate members of the United Nations. Both republics and the Soviet Union joined the UN when the organization was founded with the other 50 states on 24 October 1945. In effect, this provided the Soviet Union (a permanent Security Council member with veto powers) with another vote in the General Assembly.