...which is where my prediction (10 years ago now) of Indonesia's fate comes into it, when the world goes to war again.
Indonesia allying itself with Sino (China) only strengthens its opposition around it.
It will start with heavily armed Papuans liberating West Papua along with an alliance of: other Melanesian nations, Micronesia, Catholic Phillipines and the Hindu and indigenous peoples of Indonesia. Even the Timorese get in on it. Of course, with China's hope of Indonesia now being a buffer against any Australian activity against it for the USA. Australia won't be alone in this.
Expect a full on demolition of 'ISLAMIC' Indonesia!
Right up to the border of Malaysia, well almost.
The end result of Indonesia will be an end of Islam but a far smaller nation west of the Wallace Line or more so. There will be a new nation somewhere in amongst the liberated islands and extended nations like Timor, PNG, Hindu Bali and more.
...you might find that Indonesia won't be the strong arm of the south that China is hopeing for.