India, March 2 -- British Prime Minister Keir Starmer called for the need for a security guarantee, or backstop, from the United States to deter Russian President Vladimir Putin from invading Ukraine again if a peace deal is achieved.

Starmer has long argued that a possible European peacekeeping force would need to have a security guarantee from Trump for any peace deal to work in Ukraine. The statement comes after Starmer met Ukraine's President Volodymyr Zelensky in London on Saturday.

"I've always been clear that this is going to need a US backstop, because I don't think it would be a guarantee without it," he told BBC News.

Starmer also revealed that the UK and France have agreed to work with Ukraine on a plan to end the fighting w...