If Russia is going full bore after Japan in China, why would Germany follow?
Germany takes out Russia and the Eastern Block States (Ukraine, Belarus, etc). Italy, free of interference, takes out Africa. (Russia’s already given up, so England and America are not going to be doing much to Italy, they’re going to be busy trying to annoy Germany.)
Meanwhile, Japan turtles. I’d build an IC in Manchuria, maybe one in Kaisang as well. No biggie if you lose these since no one but an Axis player can build there anyway! (ICs on Chinese land that is liberated goes to China but China does not build units! Furthermore, since China has no capitol, you cannot lose the Chinese Capitol and liberate these for yourself!) Basically, they’re tools you can use to help you resist Russia and England for a while and when they cannot be held any longer, just give them up.
Now you have a Germany with 70+ Income and Italy with 30+ Income. Sure, Japan’s down to 8 Income maybe (I’ll give it to you that you are able to reduce Japan to only Japan by the time Italy has Brazil and all of Africa and Germany has Europe and half of Russia)
What now?