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).
Modern history of Ukraine
Ukraine officially declared itself an independent state on August 24, 1991, when the communist Supreme Soviet (parliament) of Ukraine proclaimed that Ukraine will no longer follow the laws of USSR and only the laws of the Ukrainian SSR, de facto declaring Ukraine's independence from the Soviet Union. On December 1, Ukrainian voters overwhelmingly approved a referendum formalising independence from the Soviet Union. Over 90% of Ukrainian citizens voted for independence, with majorities in every region, including 56% in Crimea, which had a 75% ethnic Russian population. The Soviet Union formally ceased to exist on December 26, when the presidents of Ukraine, Belarus and Russia (the founding members of the USSR) met in Belovezh Pushcha to formally dissolve the Union in accordance with the Soviet Constitution. And with this Ukraine's independence was formalized de jure and recognised by the international community.