The Ukrainian President Volodymyr Zelensky is back in Kyiv after three frantic days, during which he was ordered to leave the White House after a tense showdown with Donald Trump and his vice president JD Vance. 
 
He did, however, find a warmer welcome in London where he received a strong show of support from European leaders at a summit on Sunday.
  
After the London summit, Sir Keir Starmer suggested European leaders would form a "coalition of the willing" to defend Ukraine.   

Niall Paterson talks to Sky's defence and security analyst Michael Clarke to understand what that might look like and whether Europe can save Ukraine.   

Producers: Natalie Ktena  
Editor: Philly Beaumont