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 Socialist Republic
Throughout its 72-year history, the republic's borders changed many times, with a significant portion of what is now Western Ukraine being annexed by Soviet forces in 1939 from the Republic of Poland, and the addition of Zakarpattia in 1946. From the start, the eastern city of Kharkiv served as the republic's capital. However, in 1934, the seat of government was subsequently moved to the city of Kiev, Ukraine's historic capital. Kiev remained the capital for the rest of the Ukrainian SSR's existence, and remained the capital of independent Ukraine after the breakup of the Soviet Union.