In 1941 the USSR was desperate for American war materiel from trucks to tanks to aircraft and grain but the intensity of German submarine and aircraft attacks on convoys sailing to the Soviet Arctic ports meant that in the summer of 1942 they had to temporarily be suspended and re-routed by the Pacific. In the meantime the complex web of diplomacy, suspicion and mistrust between western allies and the USSR had side effects including the further mistreatment of Stalin's Polish prisoners.

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