Breakdown shows Washington now prioritises its own interests over any semblance of shared economic ground

• ‘No more!!!’: Trump lashes out after US-Canada talks devolve into trade war

The calamitous collapse of trade negotiations between Canada and the United States is a warning to nations worldwide that pursuing any kind of dialogue with the current US administration is doomed at the outset, according to observers who say this recent episode indicates seeking a fair deal is futile.

Andrea Lawlor, an associate professor of political science at McMaster University in Ontario, said: “No matter the closeness of the historical relationship, the American administration has signalled that it now prioritises its interests above those of some sort of global economic coordination or harmony.

Audio recording of US vice-president apparently made at New York fundraiser and shared with Canadian Press

Leaked audio from a private event has reportedly captured the US vice-president, JD Vance, mocking Canada for apparently capitulating in a trade deal and taunting the prime minister, Mark Carney, for trying to “out-tough” Donald Trump.

The recording, which was reportedly made at a fundraiser and shared with the Canadian Press, comes in the last stretch of a difficult negotiation in which the US president has threatened to impose 50% tariffs on Canada.