The Philippines could get involved. Depending on how aggressive things could be. They still have technically a claim over the Sabah-region in northern Borneo, currently held by Malaysia. Also claimed by Indonesia.
But I think that the Philippines might send token aid to Australia, due to their historic alliances via the USA.
Depending on situation, they could march into Sabah, especially if Malaysia collapses either due to internal stress or Indonesian activities.
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