Indonesia is ready to flare up against China and ethnic Chinese, at the drop of a hat.
They have some jihadi preachers who would love to cook up 9-11 style attack on China over their oppression of the muslim Uighurs.
With Indonesian participation, the USA could implement an effective oil blockade on China, covering all the narrow straits with land based anti-ship missiles.
China needs to step carefully around volatile Indonesia sensitivities - it is taking longer to buy off their elites, except for the ethnic Chinese.
Their military is pipsqueak.