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).
Western Ukraine
It is defined mainly in the context of European history pertaining to the 20th-century wars and the ensuing period of annexations. At the onset of World War II the whole territory was incorporated into the Ukrainian Soviet Socialist Republic (УРСР), following elections which are acknowledged as staged and specifically for the purpose to manufactured public consent for the transfer of land from occupied Poland to the Soviet Union as of October 22, 1939. Its historical background makes Western Ukraine uniquely different from the rest of the country, and contributes to its distinctive character of today.