The Ukrainian Soviet Socialist Republic or the Ukrainian SSR was a self-proclaimed partially recognized republic formed by the members of the Russian Social-Democratic Labour Party (RSDLP) some of whom were members of the Central Rada (Volodymyr Zatonsky, Georgy Pyatakov). Eventually it became one of the founding constituent Republics of the Soviet Union from its formation in 1922 to its abolition in 1991.

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