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).
Boris Bazhanov
In 1919, Bazhanov joined the local Communist Party of the Soviet Union organization, to which he later recalled having to choose between Communism or Ukrainian nationalism, stating he eventually rejected nationalism as he had been raised and associated with Russian culture. Bazhanov was soon afterwards elected district secretary, quickly rising through local party posts in Ukraine, he went to Moscow to study engineering in November 1920. The following year, when Bazhanov was 21, the political fighting within the Ukrainian territory had ended in communist victory, with territory being divided between Soviet Ukraine and Poland, with smaller regions belonging to Czechoslovakia and Romania. In 1922, Soviet Ukraine joined the newly-founded Soviet Union as its constituent republic, after which Bazhanov applied for a technical position within the Politburo of the Communist Party of the Soviet Union apparatus and was accepted by Ksenofontov.