Okay, best protection for China is to say that if they invade Taiwan that we will end all commerce with China, end all student and other visas. End them all. That would, if we followed through, have more impact than a military response.
Instant cancellation of all Mainland Chinese student visas and a ban on all imports from the PRC. Seizure of all property owned by Mainland Chinese in the United States.
What then if they call in our debt?