Why the Arctic belongs in the CANZUK conversation

The idea of closer union among Canada, Australia, New Zealand and the United Kingdom has always been sold as a story of language, law and liberal institutions. That is true, and incomplete. If CANZUK is to mean anything in a harder world, it has to look north.

Canada is an Arctic state. Forty per cent of its land mass and three-quarters of its coastline sit in the North. The Northwest Passage runs through waters Ottawa insists are internal. As the ice recedes, that claim is no longer a cartographic curiosity. It is a shipping route, a resource corridor and a military approach. Russia already treats its half of the Arctic as a fortress and an export pipeline. China calls itself a “near-Arctic state” and is building icebreakers, research stations and a Polar Silk Road in partnership with Moscow. The United States, under a president who has spoken of Greenland and even of Canada in proprietary terms, is no longer a quiet neighbour. The old assumption that the High North would remain a zone of “low tension” is finished.

CANZUK, as currently discussed, is mostly about trade, credentials and the right of citizens to live and work across four countries that already share a monarch, common law and a long habit of fighting together. Those things matter. They do not by themselves answer the question of how a mid-sized democracy defends a vast, melting frontier when its largest ally is unpredictable and its two main rivals are coordinated.

Geography supplies the answer. A functioning CANZUK arrangement would not create a new Arctic superpower overnight. It would, however, give the four countries something they lack separately: a second centre of gravity in the North Atlantic and the High North that is not Washington. Britain already sits astride the GIUK gap, the choke point between Greenland, Iceland and the United Kingdom through which Russian submarines must pass to reach the open Atlantic. Canada holds the Northwest Passage and the approaches to North America. Together they would control most of the western Arctic maritime approaches. Add the Royal Navy and the Royal Canadian Navy, and the grouping would possess the second-largest surface fleet in the world after the United States. Australia and New Zealand do not have Arctic coastlines, but they have expeditionary habits, cold-weather training relationships, and an interest in keeping sea lanes and critical minerals out of the hands of states that do not share their rules.

The practical case is straightforward. Canada cannot patrol, map, icebreak and garrison the North alone at the scale now required. It is buying icebreakers, building northern hubs and talking about taking “full responsibility” for its own sovereignty. That is necessary. It is not sufficient. The United Kingdom already trains and exercises with Canada in the High North. A deeper CANZUK defence understanding would make that routine rather than occasional: shared surveillance, common ship designs, coordinated presence, and a political signal that the Passage is not an international strait by default. For Australia and New Zealand the Arctic is distant, but the principle is not. Both countries live with the consequences of great-power competition in their own neighbourhood. A partner that can help keep the northern approaches open and rules-based is an asset, not a distraction.

There is also an economic argument that CANZUK advocates usually underplay. The Arctic holds oil, gas and, more importantly for the next decades, critical minerals. Melting ice makes some of those deposits reachable; it also makes the communities that live there more vulnerable. A CANZUK framework that treated northern development as a joint project—standards, capital, indigenous partnership, environmental rules—would be more credible than four separate national strategies competing for the same investors. Freedom of movement would let Canadian Rangers, British polar scientists, Australian mining engineers and New Zealand logistics specialists move without the friction that now exists. That is not empire nostalgia. It is labour-market common sense applied to a region that is short of people and long on strategic value.

The point is not that Ottawa, London, Canberra and Wellington should announce an Arctic command tomorrow. It is that they should stop talking about CANZUK as if it were only a mobility pact for professionals and a hedge against American tariffs. Canada’s North is the one piece of territory that the great powers actually want. If the CANZUK nations cannot coordinate there, the rest of the project will look like what its detractors have always claimed: a polite club with a flag and no map.