LONDON

British Prime Minister Keir Starmer on Monday called on the US to provide a security “backstop” to deter further Russian aggression against Ukraine, ahead of his high-stakes meeting with US President Donald Trump next week.

Speaking in Paris following emergency talks with European leaders, Starmer emphasized that a US security guarantee is the only way to ensure a "lasting peace" and prevent future attacks by Moscow.

His remarks come as Trump pushes for a swift resolution to the war, reportedly engaging in back-channel negotiations with Russian President Vladimir Putin while excluding Ukraine and European allies from the discussions.

The prime minister confirmed he would speak with Ukrainian President Volodymyr Zelenskyy “in the coming days” to reaffirm Britain’s commitment to Ukraine. He also expects further discussions with European allies after his visit to Washington.

“This is an existential, once-in-a-generation moment for our security,” Starmer warned, stressing the urgency of coordinated Western action.

UK open to troop deployment

Reiterating his position on the potential deployment of British troops to Ukraine as part of a future peacekeeping mission, Starmer stated that any such move would be contingent on a formal peace deal.

His comments reflect a growing consensus among European leaders that their nations must “step up” in terms of defense spending and military capabilities.

“Today’s talks in France were a vital first step in responding to that challenge,” he said, indicating a shift in Europe’s approach to its own security.

Trump’s push for a rapid peace deal with Russia has raised concerns among European leaders, who fear any settlement reached without Ukraine’s involvement could be unstable or even detrimental to Kyiv’s sovereignty.

Starmer’s meeting next week with the president in Washington is expected to focus on securing long-term Western support for Ukraine while urging the US to take a leading role in deterring future Russian aggression.