[My poor XF]

The build up to invade Australia would make Barbarossa look like a training drill. There is no way that sort of activity could be covered up despite china's vast wealth in materials and man power.

Indonesia poses a greater threat from invasion purely as a benefit of there geographical location and there military is a joke despite the number of enlisted personnel.

The only way we would find ourselves in a conflict with china is if we sided opposite them during any war over Taiwan.