[quote=@Dinh AaronMk]
<Snipped quote by Mihndar>

I doubt the Koreans or the Indonesians would be at all loyal to the Japanese, or only really love themselves. The native populations wouldn't really want to support them voluntarily and the ashkaris they could pull from the islands wouldn't be worth much. Not to mention Australia is basically a whole lot of nothing and full of people even more opposite to the Japanese culture than the Koreans being raped or the Indonesians. So attempting to take Australia would just mean a lot of prolonged police work as well as attracting the ire of Britain, since Australia wants to and is trying to, or already has joined the Commonwealth. So they got some political protection there.

China as well would have it support from parties in the International. And since they'd act independently then they're not coming on Beijing's orders. Aggression on mainland Asia would also most likely attract universal ire from the Asian bloc who'd have enough power in the International Politburo to all declare war on Japan. They may not be able to contribute naval assets, but they could the land assets needed to turn a landing into a proper meat grinder while mainland Japan is burned from 30,000 meters.
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Considering they've been under Japanese domination for forty-odd years, an entire new generation would have grown up that knows nothing of the pre-Japanese days and frankly probably wouldn't care nearly so much. This new population, containing almost all of the soldier-age population, would be significantly more loyal to the Empire than the older generation that remembers.

There's no guarantee they wouldn't have significant enough air assets and potentially aircraft carriers to both fend off any stuff you send off at them but also place pressure on your forces attempting to contain their landings. Naval forces bombarding your coast and air support combined could easily turn your defensive line into as much of a meat grinder as their landing area. A quasi-fascist state would have invested much more of its power into building these assets than an isolationist China, bolstered as it may be by the other bloc members.