Around 7 p.m. on Friday, Feb. 13, about two dozen high-level U.S. diplomats, politicians and four-star generals held a discussion in a briefing room on the sixth floor of the luxury Bayerischer Hof hotel in Munich. Their frank comments behind a sound-proof door were leaked, perhaps to German intelligence but certainly to the German newspapers Bild and Der Spiegel, which published reports of the discussions. They reveal a ham-handed U.S. diplomacy in Europe that has raised consternation and revulsion against the administration of President Barack Obama and by extension against NATO. Although not directly involved, Canadians can learn from the...