New Delhi, June 19 -- A year ago Donald Trump quit the G7 summit in Canada on the first evening. So it was a sign of progress that this time, over three days in the French lakeside town of Evian-les-Bains, Mr Trump stayed until the summit's end. It helped that Emmanuel Macron, this year's host, laid on a dinner for him at the Palace of Versailles ("not gold leaf [but] the real deal!" gushed Mr Trump). Wary Europeans have learned the hard way not to take Mr Trump at his word. Nevertheless, the summit ended with a mood of cautious optimism that America might possibly be persuaded to renew some support for Ukraine.

Mr Trump went to Evian at a time of acrimony and transatlantic distrust. He left calling the trip a "Great Success". The leader...