I suppose that ANZAC could prepare a fleet + troops to invade some money islands that aren’t defended (all those 4 ipc islands). Of course, Japan could crush them if he wants to dedicate alot of ressources. But then, she weakens herself in China and leaves UK unchecked. Let’s not talk about US that is only waiting for his time to enter the war.
UK could prepare a powerful ground army to attack Japan. With its fleet, it should be able to force Japan into splitting her naval forces. And if I remember correctly, UK starts with like 3-4 airplanes in India right? That’s quite powerful.
China seems to be the weakess. But with the new rules, I think China can put up a decent fight. It can lure away precious units and open a road for his allies.
I think Japan will have to adopt a balanced strategy. Hitting too hard somewhere can open some weaknesses elsewhere. But at the same time, hitting everywhere seems impossible. Especially with the huge map