You know, I have to admit. I’ve been cooling it a lot with Japan lately. Racing out to take over the world looks great on paper, but you have no security on your lines of supply.
I’m also growing to like the Sinkiang or even Novosibirsk Industrial Complex with Japan. Especially if Germany is getting hammered. (Since it helps you rebuild after an assault on Moscow.)
The idea being, Moscow falls to Japan, Berlin falls to America on the same round. If Germany owns Caucasus, the allies would be silly to liberate it. That means Japan could really use the extra 2 units right there in the red zone, and when they DO get Caucasus (if ever) it only helps them more.
Remember, you can always shut down your factories in the rear if they are no longer needed. No rule that says you MUST use all your factories to their full output capacity, eh?