Although Russia definitely did want Japan's conquered territory in China and the rest of mainland Asia - the main lasting effect of the Atomic Bombs on the geo-political outcomes of the war was giving the Americans the ability to force the surrender before Russia began its invasion of Manchuria.

This is why the Japanese attempts to negotiate a measured surrender through the Soviets were ultimately futile - it was actually in Stalin's interests to not pass on the Japanese proposals to the US, as an early peace deal would kill his opportunity to land grab in Asia.