What if as a demand for joining the war against Japan, Stalin asks for an occupation zone in Tokyo, similar to the agreements on Berlin. I don't see the USA refusing this, as it really isn't a big deal(pre-Cold War). The reasons for Stalin wanting this are obvious; influence in Japan in case there isn't time for an invasion of the islands(which there wasn't IOTL). So how does the Cold War play out if there is a North/South or East/West divide in Tokyo? It would serve as a foil to Berlin, because if the USSR cuts of West Berlin, the Americans and Japanese can cut off North Tokyo(or whatever it would be).