We should seek to diversify our allegiances with other countries in the Pacific (as long as they also increase efforts to militarise so Australia and New Zealand aren't stretched too thin), strengthening our relationship with like minded nations with Canada, the UK and those in the EU. Trump seems to hold his allies in contempt and might not care if Australia were to be invaded unless he could get something out of it.

But it's still worth keeping for now, unless something happens.