Sir Keir Starmer has warned that Vladimir Putin could “go again” in Ukraine without a security backstop after Donald Trump declined to promise that the US would be part of one.
Leaders from across Europe will gather in London on Sunday, following a week which will have seen Sir Keir, France’s Emmanuel Macron and the Ukrainian president travel for talks with Mr Trump.
The minerals agreement negotiated in recent days would open up Ukraine's vast mineral wealth to the United States but does not include American security guarantees, a disappointment for Ukraine.
The Prime Minister has already said he is prepared to deploy British troops as part of a force to safeguard any peace deal, but only if the US offers security guarantees to European soldiers.
The US President has resisted calls to fully commit American troops to peacekeeping efforts in Ukraine as part of a deal to end the three-year conflict.