The Russian Civil War, which broke out in 1918 shortly after the October Revolution, resulted in the deaths and suffering of millions of people regardless of their political orientation. The war was fought mainly between the Red Army ("Reds"), consisting of the uprising majority led by the Bolshevik minority, and the "Whites" – army officers and cossacks, the "bourgeoisie", and political groups ranging from the far Right, to the Socialist Revolutionaries who opposed the drastic restructuring championed by the Bolsheviks following the collapse of the Provisional Government, to the Soviets (under clear Bolshevik dominance). The Whites had backing from other countries such as the United Kingdom, France, the United States, and Japan, while the Reds possessed internal support, proving to be much more effective. Though the Allied nations, using external interference, provided substantial military aid to the loosely knit anti-Bolshevik forces, they were ultimately defeated.

The Bolsheviks firstly assumed power in Petrograd, expanding their rule outwards. They eventually reached the Easterly Siberian Russian coast in Vladivostok, four years after the war began, an occupation that is believed to have ended all significant military campaigns in the nation. Less than one year later, the last area controlled by the White Army, the Ayano-Maysky District, directly to the north of the Krai containing Vladivostok, was given up when General Anatoly Pepelyayev capitulated in 1923.