US president says he does not know how war will end, but ‘it will not end with a Russian defeat of Ukraine’
Russia-Ukraine war – live updates
Joe Biden has declared that the US and Nato allies will stick with Ukraine “as long as it takes” at the end of a two-day summit that saw the military alliance promise hundreds of thousands more troops to defend eastern Europe.
The US president also announced another $800m (£660m) of military aid to Kyiv – but questions remained about how much detail there was behind the plan to create a 300,000-strong force to deter any Russian attack.