Sir Keir Starmer today warned 'borders must not be changed by force' as he joined EU leaders in pressuring Donald Trump not to hand parts of Ukraine to Russia.
The Prime Minister and his European counterparts joined a call this afternoon with the US President and Ukraine's Volodymyr Zelensky.
The emergency virtual summit comes ahead of Mr Trump's meeting with Russia's Vladimir Putin in Alaska on Friday.
There are worries in London and other European capitals that Mr Trump will offer to cede Ukrainian territory to Russia as part of a ceasefire deal.
The PM used Wednesday's call to thank Mr Trump for his efforts in trying to secure an end to the three-year conflict in Ukraine.
