Chinese state media has threatened a "strike any time" on US troops in Taiwan as fears loom of an imminent invasion.
President Xi Jinping has promised "reunification" with the separatist enclave as Beijing reacted with fury to the Pentagon revelation that US forces are training troops in Taiwan.
Tensions remain at boiling point between China and Taiwan as its feared the Communist giant may attempt to reclaim the island which it claims as its own.
Chinese warplanes have been flying in record numbers into Taiwanese airspace as part of huge drills widely seen as a rehearsal for invasion.
The US has always pledged to defend Taiwan.
But should China launch an attack, Washington will face a devastating choice about risking a potentially global war with Beijing.
Taiwan insists it is an independent nation after splitting from mainland China in 1949.
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