What happens if the US walks away from a Ukraine peace deal?

JD Vance is the latest senior member of Donald Trump's administration to say the US will walk away from peace talks if there isn’t a yes from both Ukraine and Russia.   
 
But the US plan to recognise Russia's claim to Crimea would be a breach of Ukraine's constitution and so not something President Volodomyr Zelenskyy can agree to even if he wanted to keep the talks alive.  
 
On today's Sky News Daily, Niall Paterson talks to our international affairs editor Dominic Waghorn about what will happen to Ukraine and Russia - and to the UK's and Europe's relations with the US - if Trump walks away from peace talks. 
 
Producer: Soila Apparicio 
Editor: Wendy Parker