Nicholas Burns, the U.S. ambassador to China, also said he was leaving his post with deep concerns about the future of relations with China.

Donald Trump’s imperialist designs on Greenland, Canada and Panama often sound like the ramblings of a chaos agent who views geopolitics and global trade like a real estate shark chasing new leads.

For years, the U.S. government has urged China to show "restraint" in pushing its claim on Taiwan and to drop military threats to bring the democratically governed island under its control. Now - some Chinese commentators say - the power of that long-held U.