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In June 1941 many in the Soviet Union were terrified by the idea that Japan would come to the aid of it's ally and invade the Far Eastern Soviet Union. Soviet forces were unnecessarilly huge on the Japanese border and had already proved twice they could easily best the powerful Kwantung Army through superior tactics and equipment.
So what if in August 1941 the Red Army launched an all out offensive into Manchuria August storm style.They would not need to recall any troops from the western front and could have seized Manchuria and Korea.Also it is likely that the majority of these troops could have been pulled back to save Moscow as per OTL as Japan would not launch any large counter offensive on land or sea during winter.