This is a problem that should have been taken care of 20 years go with active military and logistic support to the SEAsian nations. It will now be impossible without all out war to get China to retreat. The best thing we can hope for is super typhoon to swamp them.
But, but 20 years ago, the Cold War had ended and we were enjoying the "peace dividend" by investing in social butter projects over guns. There was no threat to challenge the only super power that was left standing. Just ask William Jefferson Clinton." (sarcasm)