G7 leaders are paralysed by their fear of upsetting Donald Trump

There is no founding charter or admissions process to the self-selecting group of "leading" economic powers that currently numbers seven. It was the G8 from 1997 to March 2014. Then Russia annexed Crimea and had its membership suspended, establishing the rule that participating nations should not seize their neighbours' land. The White House used to condemn that sort of thing on the grounds that "it violates the principles upon which the international system is built". These days, not so much. On Sunday, shortly after arriving for a G7 meeting in the Kananaskis resort in Alberta, Donald Trump told his host,…