@italiansarecoming:
If an Indian IC is not the way to go then how does one slow the Japanese down?
If you say let Japan go wild and just mass shuck to russia to kill Germany will work before Japan is a threat. Will the allies be fast enough?
In my experience, the allies are indeed fast enough.
Japan indeed can get quite large (while at the same time Germany shrinks). But not large enough to take Russia if the US/UK are also sending forces. Usually in my games, Germany is deliberately contained to Europe (in a kill Germany first) and Japan is ignored, except for some minor pushbacks in North America or Russia or possibly Africa. With the usual mass of troops in Karelia it is trivial to send some forces to Moscow, then Novo to push back at the Japanese.
Once Japan gains most of Asia, where else can they go? Maybe a few ipcs in Australia, NZ, Hawaii…, but not enough to win the game and at a cost of troops that could be better utilized putting pressure on Russia. Also the US can afford to send a few forces to re-take these if they want.
Maybe Africa, but then the US/UK are closer and will simply pump sufficient troops there to kick Japan out (again at the opportunity cost of lost pressure on Russia).
If Alaska, the US can easily take it back.
So Japan is constrained (in my opinion) by the fact that other than Asia (on the way to Russia), growth opportunities are limited by the distance from Japan and the opportunity cost of the need to put pressure on Russia (hoping a combined Germany/Japan push there can take Russia before Germany falls).