In the shifting geometry of global alliances, Canada's quiet turn toward Europe has drawn a sharp rebuke from Washington. When European Commission President Ursula von der Leyen proposed a novel associate membership for Canada — a category that does not yet exist in EU law — Donald Trump responded within hours, calling the idea laughable and threatening serious tariffs against Europe. The episode reveals something larger than a trade dispute: it is a contest over whether nations can seek new anchors when old partnerships fracture, and whether that seeking will be permitted.