In a gathering that would have been unthinkable just a few years ago, the Canadian prime minister, Mark Carney, took his place yesterday among nearly fifty European leaders in Yerevan, marking the first time a non-European head of government has been invited to the European Political Community summit. The significance was unmistakable: as Donald Trump’s second term increasingly rattles the foundations of the postwar transatlantic compact, Europe is actively constructing an alternative political and economic pole, and it is reaching across the Atlantic to bring Ottawa aboard. Viewed from Brussels, the move is both defensive and assertive — a signal that the era of automatic deference to Washington is over.

The elephant in the room, as President Emmanuel Macron put it, was the United States itself. Without naming Mr. Trump, Macron warned Europe of its “over‑reliance on the US security umbrella,” while the British prime minister, Keir Starmer, conceded that alliances were “not where we want them to be” — a pointed reference to the fraying relationship with Washington. The subtext across the sumptuous halls of the Armenian capital was that American indifference to European defence, combined with a trade war deliberately provoked by the White House, has left allies scrambling for a new settlement. The European Union’s foreign policy chief, Kaja Kallas, was blunter in separate remarks, arguing that Washington’s recent military announcements proved the need to “reinforce the European pillar inside NATO.”

Mr. Carney’s presence gave the gathering a transatlantic dimension that went beyond rhetoric. “I do not believe we are condemned to submit to a more transactional, insular and brutal world,” he told the assembled leaders, drawing a direct contrast with the vision emanating from the White House. This was not a narrow protest but a declaration of intent. Citing recent polling that shows 58 percent of Canadians would prefer to join the European Union rather than become the 51st American state, the prime minister portrayed his country as a natural partner for a Europe seeking to diversify its dependencies. Analysts in London note that Canada, with its critical minerals, energy resources and stable governance, offers exactly the kind of strategic heft Europe needs to reduce its exposure to an unpredictable United States.

The implications extend well beyond the Atlantic. From Tokyo to Seoul, America’s traditional allies are watching with interest, wary that the rules‑based order that guaranteed their security for seven decades may have entered its terminal phase. Mr. Carney, who earlier this year declared that order dead, argues that “the international order will be rebuilt, but it will be rebuilt out of Europe.” That claim, bold and contested, now has the weight of concrete diplomacy behind it. The Yerevan summit did not produce a formal pact, but it established a political fact: a growing number of like‑minded democracies are no longer waiting for Washington to lead. The question that remains, and that will shadow every future encounter between European and American officials, is whether the transatlantic relationship can survive this slow, deliberate uncoupling.