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Bolsheviks overthrow provisional government led by Alexander Kerensky, with workers and sailors capturing government buildings and the Winter Palace in St Petersburg, and eventually taking over Moscow.
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Civil war between Bolsheviks, or Reds, and anti-Bolsheviks, or Whites, ravages Russia. In northern Russia, British, French and US troops capture Murmansk and Archangel until 1919, while in the Russian Far East they occupy Vladivostok, which was held by the Japanese until 1922.
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War with Poland
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Union treaty formally joins Russia, Ukraine, Belarus and the Transcaucasus - which were divided in 1936 into Georgia, Armenia and Azerbaijan - into the Soviet Union.
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Soviet Union adopts constitution based on the dictatorship of the proletariat and stipulating the public ownership of land and the means of production; Lenin dies and is replaced by Joseph Stalin.
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Soviet Union admitted to League of Nations.
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September - Congress of People's Deputies votes for the dissolution of the Soviet Union.
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Leaders of Russia, Ukraine and Belarus sign agreement setting up Commonwealth of Independent States.
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Russian government takes over offices of USSR in Russia.