In Siberia, Admiral Kolchak's army had disintegrated. He himself gave up command after the loss of Omsk and designated Gen. Grigory Semyonov as the new leader of the White Army in Siberia. Not long afterward, Kolchak was arrested by the disaffected Czechoslovak Corps as he traveled towards Irkutsk without the protection of the army and was turned over to the socialist Political Centre in Irkutsk. Six days later, the regime was replaced by a Bolshevik-dominated Military-Revolutionary Committee. On 6–7 February Kolchak and his prime minister Victor Pepelyaev were shot and their bodies were thrown through the ice of the frozen Angara River, just before the arrival of the White Army in the area.

Remnants of Kolchak's army reached Transbaikalia and joined Semyonov's troops, forming the Far Eastern army. With the support of the Japanese army it was able to hold Chita, but after the withdrawal of Japanese soldiers from Transbaikalia, Semenov's position became untenable, and in November 1920 he was driven by the Red Army from Transbaikalia and took refuge in China. The Japanese, who had plans to annex the Amur Krai, finally pulled their troops out as Bolshevik forces gradually asserted control over the Russian Far East. On 25 October 1922 Vladivostok fell to the Red Army, and the Provisional Priamur Government was extinguished.