The Russian Caspian Sea Flotilla in June 1942

American naval attaché at Moscow, Russia reported in June 1942 referred to a British officer who recently stayed at Baku [Azerbaijan] and sighted 4 small Russian destroyers around 700 tons each. Other British observers reported that the Caspian Sea Flotilla included 12 sloops, around 3 gunboats and at least 1 submarine.

Source

National Archives USA. Record Group 38: Records of the Office of the Chief of Naval Operations. Series: Secret Naval Attaches Reports. Estimate of potential military strength (pt.). Summaries. Reports from London, Paris, Brussels, Rome and Berlin. Roll M975-001.