Nato will stick with Ukraine as long as it takes, says Joe Biden

US president says he does not know how war will end, but it will not end with a Russian defeat of Ukraine'

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 of military aid to Kyiv - but questions remained over how much detail there was behind the plan to create a 300,000-strong force to deter any Russian attack.