[Seruzawa]

Soviets had no chance. They had no sealift capacity. You need ships. Big ones configured for sealift. This is still true today. Airlift will not bring in enough heavy gear, supplies, etc.

[DesertRhino]

Not exactly accurate. Look up “Operation Hula”.

https://en.wikipedia.org/wiki/Project_Hula#:~:text=Project%20Hula%20was%20a%20secret,Island%2C%20and%20the%20Kuril%20Islands.

In the spring of 1945 through early September 1945, we sent 149 warships and large LCI landing craft to them and trained about 12,000 of their men in Alaska. We were giving them sealift to land in Japan.