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–Soviet War
The end of the war saw the incorporation of most of the territories of Ukraine into the Ukrainian Soviet Socialist Republic which, on December 30, 1922, was one of the founding members of the Union of Soviet Socialist Republics (USSR). Parts of Western Ukraine fell into under the control of the Second Polish Republic, as laid out in the Peace of Riga. The UNR government, led by Symon Petlura, was forced into exile. For the next few years the Ukrainian nationalists would continue to try to wage a partisan guerrilla war on the Soviets. They were aided by Polish intelligence (see Prometheism); however they were not successful. The last active Ukrainian movements would be mostly eradicated during the Holodomor. Further, the relative lack of Polish support for the Ukrainian cause would cause a growing resentment on the part of the Ukrainian minority in Poland towards the Polish interwar state.