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It was established on December 1, 1939, in the then-Finnish town of Terijoki (which is now Zelenogorsk in the Leningrad Oblast of Russia). During its lifespan its Otto Ville Kuusinen was chairman and head of government.
On March 12, 1940, it was merged with the Karelian ASSR within the Russian SFSR to form the Karelo-Finnish SSR, a Soviet republicIn its final decades of its existence, the Soviet Union consisted of 15 Soviet Socialist Republics SSR , often called simply Soviet republics . All of them were socialist republics, and all of them, with the exception of Russia had their own Communist par in its own right.