The United Kingdom and France have agreed to deploy forces in Ukraine if it strikes a peace deal with Russia, British Prime Minister Keir Starmer said, in a renewed push by Western leaders to guarantee Kyiv’s post-war security and deter Moscow from further aggression.

The United States for the first time on Tuesday backed a broad coalition of Ukraine's allies in vowing to provide security guarantees that leaders said would include binding commitments to support the country if Russia attacks again.