The Don-class submarine tender was the NATO reporting name for a group of seven submarine tenders built for the Soviet Navy in the late 1950s. The Soviet designation was Project 310 Batur. Evolving from a need for dispersed basing of submarines in the advent of a nuclear war, the ships were designed to support distant operations of the Soviet Union's submarine fleet, capable of repairing and resupplying. However, the Soviets returned to stationary basing of their submarines and the Don class were later converted into flagships. One vessel was exported to Indonesia in 1962 and due to the ship's heavy armament, was used primarily for patrol duties. The ships of the Don class were removed from service in the mid 1990s and broken up for scrap.