"The only person who can do this is President Donald Trump and he will do it. They're tired of killing each other out there," Keith Kellogg said.

Zelensky is personally deeply invested in his own peace plan, particularly as Ukrainians have made enormous sacrifices in the war so far. This does not rule out compromises, but it makes concessions to China, widely seen by Ukrainians as one of Russia’s main supporters in the war, very unlikely.

Donald Trump has said he “vehemently” disagrees with the decision to permit Ukraine to strike targets within Russia with US-supplied long-range missiles.