Force K exposed the limits of Arctic basing in northern Russia

Force K brought together HMS Nigeria, HMS Aurora, and the Tribal-class destroyers Punjabi and Tartar after Vian had flown to Russia to assess naval cooperation. The proposed northern bases lacked the air defenses needed to shelter British surface ships, while Soviet submarines submerged each day to avoid German aircraft. Their crews also lacked practice because too little fuel had been available for training. In the account of Vian's mission, an investigation traced the shortage to a former political commissar's diversion of fuel-storage funds into accommodation for political officers, followed by rapid action from the Soviet authorities. Protected anchorages, fuel infrastructure, and trained crews set the practical limit on what allied goodwill could achieve.