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).
Ukrainian War of Independence
In 1922, the Russian Civil War was coming to an end in the Far East, and the Communists proclaimed the Union of Soviet Socialist Republics (USSR) as a federation of Russia, Ukraine, Belarus and Transcaucasia. The Ukrainian Soviet government was nearly powerless in the face of a centralized monolith Communist Party apparatus based in Moscow. In the new state, Ukrainians initially enjoyed a titular nation position during the nativization and Ukrainization periods. However, by 1928 Joseph Stalin had consolidated power in the Soviet Union. Thus a campaign of cultural repression started, cresting in the 1930s when a massive famine – the "Holodomor" – struck the republic, claiming several millions of lives. The Polish-controlled part of Ukraine had a different fate – there was very little autonomy, both politically and culturally – but it was not affected by famine. In the late 1930s the internal borders of the Ukrainian SSR were redrawn, yet no significant changes were made.