The World in Brief from The Economist

Britain’s prime minister pledged to “keep on fighting” after his Labour Party lost a parliamentary by-election in a Manchester constituency it has long considered a safe seat

America’s ambassador in Jerusalem told embassy employees that they may leave Israel and, if they planned to do so, that they should depart on Friday; OpenAI raised $110bn in its largest funding round to date, a deal that values the AI company at $730bn.

Pakistan’s defence minister declared “open war” on Afghanistan after launching “counter strikes” on Kabul and Kandahar. Also, Paramount looked set to win the race to buy Warner Bros Discovery after Netflix declined to sweeten its bid.

Paramount was poised to secure a deal to buy Warner Bros Discovery, a bigger rival film studio, after Netflix declined to sweeten its bid.

Afghanistan attacks Pakistan; American mortgage rates fall, and more

Shares in Nvidia ended flat in after-hours trading, despite the artificial-intelligence pioneer reporting strong earnings and projected sales of $78bn for the current quarter. Volodymyr Zelensky said he had spoken with Donald Trump ahead of a meeting between America and Ukraine in Geneva on Thursday.

Nvidia reported strong earnings and projected sales of $78bn for the current quarter, above analysts’ estimates of about $72bn.

Larry Summers resigns over Epstein ties; Cuba kills four on American speedboat, and more

Donald Trump delivered the longest state-of-the-union address on record. Also, Pete Hegseth gave Anthropic until Friday to remove restrictions it has applied to the way the Pentagon uses its Claude models.