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).
Mikhail Gorbachev
With the country in a state of near collapse, Gorbachev's vision of a renewed union effectively received a fatal blow by a Ukrainian referendum on 1 December, where the Ukrainian people overwhelmingly voted for independence. Ukraine had been the second most powerful republic in the Soviet Union after Russia, and its secession ended any realistic chance of the Soviet Union staying united even on a limited scale. The presidents of Russia, Ukraine and Belarus met in Belovezha Forest, near Brest, Belarus, on 8 December and signed the Belavezha Accords, which declared the Soviet Union had ceased to exist and formed the Commonwealth of Independent States as its successor. Gorbachev initially denounced this move as illegal. Nonetheless, there was no longer any doubt that the Soviet Union, in the words of the Accords' preamble, no longer existed "as a subject of international law or geopolitical reality."