Ok here goes, Soviets convince the Allies to take on the responsibility of Operations Olympic and Coronet slated for sometime in 1946, so the US lends the 3,000 to 5,000 ships and other vessels estimated to be needed for the campaign, and to get them to Vladivostok without getting hammered by Kamikaze attacks

Japan by this time would have had time to recover somewhat and built up and extensive home defence force of over 150 divisions or more, plus she would have at least something like 10,000 aircraft slated for Kamikaze role.

I have a copy of declassified material on Operation Coronet and Olympic, they estimated some 2 million troops would be needed, and expected at least something like a 60% casualty rate if not more to achieve the land invasion of Japan.

So if this was to occur the Soviets would suffer at least 1.2 million dead, with Hundreds of thousands wouned and missing, but just say after all this the Soviets prevail and win with the costliest battle in history, we then would have the Soviet Union incharge of the entire Northern Western Pacific.