A day before the Soviet Union declared war on Japan on 9 August 1945, the flotilla leader, transferred to the 1st Destroyer Division of the Light Forces Detachment, entered the active fleet. On 9 August, she was located in the Ulysses (Uliss) Bay off Vladivostok, and was ordered to move to the northerly anchorage of Zolotoy Rog off the same port. Under the flag of fleet commander Admiral Ivan Yumashev, she transported a hundred-man company of naval infantry from the 354th Naval Rifle Battalion to Vityaz Cove in Posyet Bay on 12 August. From there, the company was loaded onto torpedo boats for an amphibious landing at the Korean port of Rason. This was her only major operation during the war, but did not involve contact with the Japanese. Yumashev slated "Tbilisi" to serve as flagship for a projected invasion of Hokkaido in an order of 19 August, but the operation was cancelled. She continued to serve with the Pacific Fleet postwar and on 12 January 1949 was reclassified as a destroyer like her surviving sister ships. Between 1951 and 24 January 1955 she underwent a major refit and modernization at Dalzavod. "Tbilisi" was withdrawn from active service on 18 April 1958, disarmed, and converted into the target ship "TsL-50". A year later, the ship was renamed "TSP-50", before being struck on 31 January 1964 and scrapped at Vladivostok by the Main Directorate for the Procurement, Processing and Sale of Secondary Ferrous Metals.