Emmanuel Macron’s lightning visit to the White House was a tour de force of French diplomatic energy, skill and bravado. Whether Macron has managed to convince Donald Trump of the need to involve Kyiv and Europe in US-Russian negotiations on the war in Ukraine will become clear in the next fortnight. But what it demonstrated forcefully was the striking humiliation of the British Prime Minister Keir Starmer and the slothful incompetence of diplomacy in London and Washington. It