Behind the scenes and on-camera, combustible personalities and shifting politics in the U.S. and Europe resulted in decisions on security that could echo for years - including reopening the debate on nuclear weapons.

European countries have intensified talks on sending peacekeepers to Ukraine to monitor and enforce a possible ceasefire. But the potential deployment of European peacekeepers to Ukraine faces a lot of challenges and uncertainties.

Keir Starmer’s spokesman has rejected Donald Trump’s claim that Ukraine could cease to exist after its war with Russia. Speaking to reporters on Monday, the prime minister’s representative said the UK has always focused on making sure Ukraine emerges as a “sovereign territory”,