The following year, "Tatsuta" was assigned to the IJN 2nd Fleet, and patrolled the east coast of Russia, providing support to Japanese troops in the Siberian Intervention against the Bolshevik Red Army. She was transferred to the reserves at Sasebo on 1 December 1921. "Tatsuta" was reactivated for one year, from 1 December 1922 to 1 December 1923, and again from 6 June - 31 August 1926, when she was assigned to patrols of the mouth of the Yangtze River.