Soviet Union intended transferring ships of Far East Fleet to the Northern Fleet in 1943

American naval attaché at Moscow, Russia reported in May 1942 that the Soviets intended, according to reliable information, to transfer ships of the Far Eastern Fleet via the Northern Passage to the Northern Fleet.

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.