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"CDC guidelines are still recommended but not required, and the president is the most tested man in America," she said, referring to the Centers for Disease Control and Prevention. "It's his decision whether to wear a mask."

"China firmly opposes it. It is a typical unilateral and protectionist practice," said Chen Fuli, director-general of the ministry's Department of Treaty and Law.

"But we've been working to try and mitigate that by caring for our staff, indicating to them that we're talking to our government about making sure they can stay here, have lives here, that they can move around Europe with relative ease whatever the immigration policy or restrictions might be in the future, that this group of staff gets looked after," he said.

"But we do know this: No one man's action can build a wall between us and a better day, no matter how evil, how thoughtless, or how destructive."

"China is a land of incredible natural extremes, with deserts, ice, vast mountains, sweeping rivers and even a tropical island," said Xue Ling, director of CNTO London. "These channels will provide a vital link between CNTO London and the wider online travel and tourism community."