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).
Carpathian Ruthenia during World War II
Carpathian Ruthenia was a region in the easternmost part of Czechoslovakia (Subcarpathian Ruthenia, or Transcarpathia) that became autonomous within that country in September 1938, declared its independence as the "Republic of Carpatho-Ukraine” in March 1939, was immediately occupied and annexed by Hungary, invaded by the Soviet Red Army in 1944 and incorporated into the Ukrainian Soviet Socialist Republic in 1946.