Someone wrote about this being an economic game. I agree, and here is some insight from a business perspective:
China is NOT a major player, but poses a threat if not contained. In order to mitigate that threat, Japan must take and hold Yunnan or invest resources deeply into a ground war.
Once that objective has been met, you have to re-evaluate your position:
India presents a Single Point of Failure for your mitigating strategy of holding Yunnan which is KEY to your strategy against the Chinese. To be clear, the SPF is that units purchased in India can reach Yunnan in a single round. From a business perspective, this is unacceptable. Your options are to continue to invest in units in Yunnan, or to eliminate that SPF via conquest.
In order to remove the India threat, you will first have to deny it resources through either Conquest (DEI, Borneo, Malaya, Kwangtung) or through Convoy (SZ’s around those territories). A combination of both Conquest and Convoy should address the resource denial phase.
Once the resources are denied to India, the Conquest and removal of the SPF threat can be accomplished. This takes planning and “strategery” from the very beginning of the game.
You have to get units into position to attack India, and also have enough of them to minimize your economic loss for accomplishing it. Further, you have to mitigate defenses in place to prevent your resources from reaching India. This involves strategic moves on J2 to first remove blockers and then move units through later on.
In effect:
J1: 3 Trn, Take FIC, Yunnan
J2: NB in FIC, clear out SZ37, and either SZ38 or SZ41. Stage Trn with invasion force in SZ36, NCM fleets to prevent new blockers from arriving. Assess resource centers of India and Anzac in the South Pacific and setup Subs to Convoy those locations if possible.
J3: Invade India, taking losses in an economic way to further your next objective (Anzac, USA, Fly Aircraft to cover a German advance in Russia, whatever)