The prime minister's visit to China is a declaration that the UK will no longer be a simple passenger in a contest defined in Washington and Beijing "I'm often invited to simply choose between countries.

Donald Trump said it was "very dangerous" for the UK to do business with China, as Prime Minister Sir Keir Starmer arrived in Shanghai on the third day of his visit to the country.

The biggest commercial announcement came from AstraZeneca, which promised to invest $15bn (£11bn) in China over the next four years, to expand research and the manufacturing of medicines – the company...