LONDON — The second Trump administration may have ruffled the feathers of America’s allies, but there is also evidence it has boosted world leaders scrambling to deal with the White House’s norm-busting approach.

Some have gained plaudits for meeting Trump head-on, while others have taken a more nuanced line between flattering the president and trying to shore up their own interests against the headwinds blowing from Washington.

Canada’s Mark Carney is poised to win next month’s…