The meeting was the first time since Russia's full-scale invasion of Ukraine that Russian and American delegations are known to have met face-to-face.

British Prime Minister Keir Starmer said on Monday that there must be a U.S. security commitment for European countries to send postwar peacekeeping forces to Ukraine and it was too early to say how many British troops he would be willing to deploy.

European leaders are planning an emergency summit in Paris on Monday amid concerns the continent is being shut out of plans to end Russia's war with Ukraine.