A quiet meeting beside a fireplace in 1940 helped build the foundation for nearly every major defense partnership between the United States and Canada over the last eight decades. Now, under Prime Minister Mark Carney’s push for what he calls “strategic autonomy” from Washington, that framework is beginning to crack.
This week, Under Secretary of War Policy Elbridge Colby announced that the United States is suspending participation in the Permanent Joint Board on Defense, the bilateral defense body created after the Roosevelt–Mackenzie King agreement that coordinated continental security policy for 86 years. The move stunned defense observers on both sides of the border and marked one of the sharpest public breaks in modern U.S.-Canada military relations.
According to Colby, the decision followed months of internal review and reflected growing frustration inside the Trump administration over Canada’s direction under Carney.
“Canada has failed to make credible progress on its defense commitments,” Colby stated, adding that the Department of War needed to “reassess how this forum benefits shared North American defense.” He also pointed directly to Carney’s speech earlier this year at the World Economic Forum in Davos, where the prime minister openly criticized American “hegemony” and argued that allies should reduce dependence on the U.S.-led order.
“The days of our military sending 70 cents of every dollar to the United States are over,” Carney declared during that speech, framing “strategic autonomy” as a central goal of his government.
Washington appears to have taken him at his word.
The suspension effectively freezes one of Canada’s most important channels for military coordination with the United States. The Permanent Joint Board on Defense has long served as a key mechanism for intelligence sharing, Arctic planning, NORAD modernization discussions, logistics coordination, and continental defense strategy. Without it, Ottawa loses direct influence over many of the systems and planning structures that underpin North American security.
For Carney, the decision creates a political and military test. His government has repeatedly argued that Canada should diversify away from American suppliers and deepen defense ties with European partners. But separating from U.S. defense infrastructure carries costs that are difficult to replace quickly, particularly for a country whose military procurement, logistics, and surveillance capabilities remain deeply integrated with Washington.
The Arctic has become one of the clearest examples of that tension.
Carney has publicly endorsed NORAD modernization and stronger continental defense, yet his government has also aligned with Denmark and Greenland in opposing proposals that would have expanded American strategic access in the region. U.S. officials view Arctic control as increasingly urgent amid growing Russian and Chinese activity across northern shipping routes and military corridors.
That contradiction has fueled skepticism inside the administration.
On other foreign policy issues, Carney’s messaging has often shifted depending on the audience. He has condemned Iran’s regime and supported blocking its nuclear ambitions, while simultaneously criticizing Operation Epic Fury as a violation of international norms. He has ruled out direct Canadian military involvement in any future Strait of Hormuz conflict tied to Tehran. Earlier this year, President Trump reportedly removed Canada from participation in the Gaza Board of Peace after Carney publicly criticized the board’s structure and objected to limits on U.N. oversight.
The contrast with former Prime Minister Justin Trudeau has become increasingly notable. Despite repeated clashes with Trump during the first administration over tariffs and NAFTA, Trudeau maintained consistent defense coordination with Washington. His government committed to a major increase in defense spending and signed joint statements with the United States emphasizing the urgency of NORAD modernization.
The Trump administration now views continental defense through the lens of great-power competition. Officials believe North America requires a hardened forward posture capable of countering Chinese and Russian influence, particularly in the Arctic. From Washington’s perspective, Canada’s slow procurement timelines and growing interest in European systems complicate that strategy and weaken interoperability during a crisis.
American officials also worry that prolonged friction between Ottawa and Washington benefits Beijing directly by slowing defense integration and creating uncertainty inside NORAD planning structures.
For now, Carney is publicly minimizing the significance of the suspension. During a news conference in Quebec, he described the board as having “a long heritage” but insisted he “wouldn’t overplay the importance of this.” He reiterated that Canada remains committed to defense coordination with the United States while continuing to pursue broader partnerships abroad.
But the symbolism is difficult to ignore.