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).
Russians in Ukraine
The Ukrainian SSR was "de jure" a separate state until the formation of the USSR in 1922 and survived until the breakup of the Soviet Union in 1991. Lenin insisted that ignoring the national question in Ukraine would endanger the support of the Revolution among the Ukrainian population and thus new borders of Soviet Ukraine were established to the extent that the Ukrainian People's Republic was claiming in 1918. The new borders completely included Novorossiya (including the short-lived Donetsk-Krivoy Rog Soviet Republic) and other neighboring provinces, which contained a substantial number of ethnic Russians.