Yeah, this causes a real problem. In AAP40, its Japan vs. USA, UK, ANZAC, and China. So its most likely:
Japan
ally
ally
ally
ally
OR you can combine UK/ANZAC and USA/China
In AAE40, theres Germany & Italy vs. USA, UK, France, Russia. So its most likely:
Germany
France
UK?
Italy
Russia
USA?
In this instance, France would be take out G1, so perhaps UK could take its place.
Or perhaps theres no Russia or USA until they declare war/get attacked:
Germany
France
Italy
UK
Then Russia and USA can enter to a certain spots when they join the war.
Finally, in the full game, it must be something like:
Germany
France
UK
Italy
Russia
Japan
USA