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"Canadians can feel confident that the review process was rigorous and that we have strong monitoring systems in place. Health Canada and the Public Health Agency of Canada will closely monitor the safety of the vaccine once it is on the market and will not hesitate to take action if any safety concerns are identified," Health Canada said in a statement.

"But whether Douyin can maintain this success remains a question, as youngsters' interests can change quickly. It depends on how the platform is going to operate in the long term," he said.

"China is an absolutely critical market for us, and we are really excited about recent development of our business in China," said Michael Kerr, the company's vicepresident.

"China is already enormously influential in the world, but I think there's much, much more to come," said Perry at an award-giving ceremony at Chinese embassy in London on Monday.

"China has played a leading role as the world's second largest economy by contributing Chinese wisdom and strength to global governance," Zhao said.