Canada's Review of US Military Risks and Alliance Diversification: Background and Strategic Directions for South Korea
Executive Summary
Canadian Prime Minister Carney disclosed that his government reviewed the possibility of US President Donald Trump using military force against Canada. This is the result of tariff pressures spilling over from an economic conflict into an issue of sovereignty infringement, with domestic public opinion in Canada supporting a reduction in reliance on the US providing policy legitimacy. In parallel, Canada is increasing its defense spending to 4% of GDP by 2030 while simultaneously expanding cooperation channels with the EU, Vietnam, and China. US-Canada relations are highly likely to drift into a prolonged "middle ground" rather than a complete breakdown or a comprehensive settlement, and this statement indicates that the situation has progressed beyond trade friction to a stage involving the collapse of security trust. The South Korean government and businesses need to re-evaluate Canada not as a fixed US ally, but as a middle-power actor actively redesigning its relationship with the US, and position themselves as early partners in defense procurement, critical minerals, and supply chain cooperation.
I. Current Issue Analysis
Issue Analysis: Canada's Disclosure of US Military Risk Review and Alliance Diversification
1. Background and Developments
Early in his term, President Trump imposed tariffs on Canadian products under the pretext of blocking fentanyl and addressing illegal immigration [3][6]. The justification for tariffs was subsequently expanded to the steel, aluminum, and automotive sectors [3][6]. Even the issue of smoke from Canadian wildfires blanketing the northeastern United States was mobilized as a basis for tariff threats [3][6]. A 10% tariff based on a Section 301 investigation into forced labor was also implemented during the same period [3][6].
The Peterson Institute for International Economics evaluated that this tariff imposition set a record for a lack of legitimacy [2]. It pointed out that the United States mobilized outdated legal bases that had already lost their effectiveness [2].
In July, a 50% tariff on overall Canadian imports was announced [3][6]. Negotiations broke down completely on August 21 [3][6]. The following day, August 22, the United States put into effect a 50% tariff on approximately $20 billion worth of Canadian products [3][6]. On the day of the breakdown, Prime Minister Carney announced the launch of economic and security negotiations with the EU [3][6]. Canada implemented retaliatory tariffs of the same scale on September 8 [6].
During this period, Canada also resumed defense dialogue with China for the first time in eight years [6]. This is the background against which Canada's diversification strategy—moving away from a US-centric structure to simultaneously utilize European and Chinese channels—took concrete shape [6].
2. Current Situation
In a New York Times interview published on September 23, Prime Minister Carney revealed that his government had reviewed the possibility of President Trump using military force against Canada [1][4]. This was in response to President Trump's repeated remarks about incorporating Canada as the "51st state" [7][9]. Carney defined this as an "extreme tail risk" [4][11]. The logic is that while the probability of occurrence is low, failing to prepare for it would be irresponsible [4][11].
Prime Minister Carney justified this statement by saying, "A prime minister has a responsibility to look at extreme tail risks" [1]. He added that it was merely a scenario check for risk management purposes and not the baseline scenario [11].
This statement was also covered significantly in Spanish-language media. El Mercurio and El Financiero reported that Prime Minister Carney admitted to reviewing the possibility of US military action following President Trump's repeated "51st state" remarks [7][9].
Around the same time, Canada pledged to increase its defense spending to 4% of GDP by 2030 [13]. Former Chief of the Defence Staff Wayne Eyre welcomed Carney's investment plan but pointed out that the pace of implementation is slow compared to the speed of geopolitical changes [13]. His assessment is that a greater sense of urgency is required [13].
Relations with Vietnam were also upgraded during this period. On the occasion of Vietnamese Communist Party General Secretary To Lam's visit to Ottawa, the two countries upgraded the comprehensive partnership established in 2017 to a strategic partnership [14]. In a joint statement, the two nations specified that their relationship is based on mutual respect for each other's political systems, sovereignty, and territorial integrity [14].
The Council on Foreign Relations (CFR) projected that Prime Minister Carney would further diversify international partnerships on the occasion of the UN General Assembly [5]. Observations were also raised that Canada is on the verge of joining the EU as an associate member [5]. However, some assessments suggested that tangible policy outcomes through the New York roundtable would be difficult to expect [5]. The analysis indicates that the practical benefit Carney could gain is improving his external image as a supporter of international cooperation [5].
The Globe and Mail evaluated that while Canada had remained a supporting actor on the international stage for years, it is gaining a new status on the UN stage this year [12]. The diagnosis is that a nation of 41 million people is showing a different attitude on the world's largest diplomatic stage [12].
3. Key Actors and Positions
Prime Prime Minister Carney and the Canadian Federal Government: They made clear their stance to break free from US pressure infringing on their sovereignty through tariffs and trade agreements [1]. By voluntarily disclosing the review of military risks, they appear to have aimed to imprint a state of vigilance against the Trump administration both domestically and internationally. There is a clear direction toward structurally reducing security dependence on the US by increasing defense spending and expanding partnerships in Europe and Asia [13][6].
Canadian Public Opinion: According to EAI analysis, support for reducing dependence on the US reaches 64%, and support for halting negotiations stands at 76% [3]. This serves as the foundation that provides political legitimacy to the government's hardline stance [3].
Former Defense Leadership: Former Chief of the Defence Staff Wayne Eyre agreed with the direction of Carney's defense investment but pointed out a lack of urgency in the pace of implementation [13]. This represents the internal military view that responses to geopolitical changes and new technological threats are slow [13].
The Trump Administration: It has continuously expanded the justifications for tariffs, citing fentanyl, immigration, wildfires, and forced labor [3][6]. By repeating remarks about incorporating Canada as the 51st state, it maintains the level of pressure on Canada even in terms of political rhetoric [7][9]. It has also expressed its intention to impose additional tariffs on Canada in late September [10].
The EU and Europe: Following Prime Minister Carney's hardline response, his close alignment with EU Commission President Ursula von der Leyen and French President Emmanuel Macron has been highlighted [10]. While the EU showed a conciliatory attitude in its trade conflict with the US, Canada stood in contrast by breaking off negotiations in August and opting for a hardline path of imposing retaliatory tariffs [10].
Asia-Pacific Partners, Including Vietnam: General Secretary To Lam's visit to Ottawa and the upgrade to a strategic partnership demonstrate that Canada's axis of diversification is not limited to Europe but is also extending to Asia [14].
4. Key Issues
The first issue is the effectiveness of disclosing the military risk review. Prime Prime Minister Carney himself drew a line, stating that it is "not the baseline scenario" [11]. This can be interpreted as placing the emphasis on rallying domestic public opinion and sending an external message rather than actually escalating military tensions.
The second issue is the sustainability of the diversification strategy. EAI projected a 55% probability that Canada-US relations will drift into a prolonged "middle ground" rather than a complete breakdown or a comprehensive settlement [3]. The key is whether European and Asian channels will progress beyond symbolic levels to enter the stage of institutionalization within this period [3][6].
The third issue is the execution speed of defense investments. Although the target of 4% of GDP has been set, even the former Chief of the Defence Staff is publicly pointing out a lack of urgency [13]. The gap between declarative diversification and the actual building of defense capabilities is a variable that will determine the credibility of Canada's future security strategy.
II. In-Depth Issue Analysis
In-Depth Issue Analysis: Structural Background of Canada's US Military Risk Review and Alliance Diversification
1. Root Cause Analysis
The root causes are divided into two levels. The first is economic pressure. The process in which the justifications for tariffs continuously expanded from fentanyl and immigration to steel, automobiles, wildfires, and forced labor solidified the perception within Canada that US demands went beyond resolving trade imbalances [3][6]. The second is the spillover into sovereignty issues. In his interview with The New York Times, Prime Minister Carney defined this as pressure of "sovereignty infringement" through tariffs and trade agreements [1]. In effect, economic coercion has been reframed as an issue of territorial sovereignty.
The Peterson Institute for International Economics pointed out that the United States mobilized "outdated legal bases that have already lost their effectiveness" to impose tariffs [2]. As measures with weak legal legitimacy were repeated, a judgment took hold within the Canadian government that it was difficult to interpret US actions within predictable norms. The review of extreme scenarios is an extension of this judgment.
2. Structural Context
Political Structure
Prime Minister Carney's hardline stance is backed by domestic public opinion. Public opinion, with 64% in favor of reducing dependence on the US and 76% in favor of halting negotiations, provides political legitimacy to the government's measures [3]. This is a policy line reflecting the sentiments of the majority of Canadian voters rather than Carney's personal choice.
At the same time, Canada is undergoing a shift in its status on the international stage. The Globe and Mail evaluated that while Canada had remained a supporting actor in international diplomacy for years, it is receiving more attention on the UN stage this year [12]. The CFR also projected that Prime Minister Carney, on the verge of Canada joining the EU as an associate member, could utilize the UN General Assembly to further diversify international partnerships [5]. However, the outlet also pointed out that it would be difficult for Carney to achieve tangible policy outcomes through the New York roundtable [5].
Economic Structure
The United States is Canada's largest trading partner and a key source of defense procurement. This structure itself has constrained Canada's bargaining power. However, following the breakdown of negotiations on August 21, Prime Minister Carney announced the launch of economic and security negotiations with the EU on the very same day [3][6]. In effect, the tariff clash immediately led to the establishment of alternative channels. NZZ reported that, unlike the EU, Carney broke off negotiations and pushed ahead with retaliatory tariffs when the Trump administration's demands did not sufficiently recede from their maximum, evaluating that this hardline path resulted in elevating Carney's standing within Europe [10].
Security Structure
Canada has pledged to increase its defense spending to 4% of GDP by 2030 [13]. Former Chief of the Defence Staff Wayne Eyre welcomed this plan but pointed out that implementation is slow compared to the pace of geopolitical changes [13]. The gap between the pledge to expand the defense budget and the actual speed of execution shows that a time lag exists between Canada's declaration of security self-reliance and its acquisition of actual capabilities. During the same period, Canada also resumed defense dialogue with China for the first time in eight years [6]. This confirms the breadth of diversification, with the Chinese channel being operated in parallel alongside the European channel.
3. Historical Precedents and Comparison of Similar Cases
The fact that Canada officially reviewed the possibility of US military action is itself unprecedented in the history of bilateral relations. During the Cold War, Canada virtually integrated its defense with the United States under the North American Aerospace Defense Command (NORAD) framework. This statement is an event that shakes that very premise. Prime Minister Carney's description of this as an "extreme tail risk" while drawing a line that it is "not the baseline scenario" [4][11] is unprecedented, as he publicly used crisis management language that is not typically discussed among allies.
Instead, points of comparison can be found in Canada's trend of upgrading relations with Europe and Asia. A representative example is the upgrading of relations with Vietnam from a comprehensive partnership to a strategic partnership [14]. In the joint statement, the two countries specified that their relationship is "based on mutual respect for political systems, independence, sovereignty, and territorial integrity" [14]. This can be read as an attempt by Canada to compensate for the principle of mutual respect, which it feels is lacking in its relationship with the United States, by codifying it in relations with other partners. The launch of economic and security negotiations with the EU and the resumption of defense dialogue with China are also measures in the same context [3][6].
As an example of economic conflict spilling over into security distrust, recent discussions surrounding US policy toward Iran and Venezuela are also worth noting. The CFR reported that President Trump seeks to highlight intervention in Venezuela as a diplomatic achievement [5]. Given that the pattern of the Trump administration utilizing military options as political assets is being repeated, Canada's risk assessment takes on the character of a preemptive response to this administration's unique behavioral patterns.
4. Key Variables Shaping Future Developments
The first variable is the pace at which the Trump administration expands its justifications for tariffs. If the pattern of expanding justifications—which has progressed from fentanyl and immigration to steel, automobiles, wildfires, and forced labor [3][6]—continues to find new subjects in the future, mistrust of the US within Canada is highly likely to become more deeply entrenched.
The second variable is the level of institutionalization in EU-Canada relations. The extent to which discussions on associate membership actually progress [5] will serve as a yardstick for measuring whether Canada's diversification strategy remains symbolic rhetoric or becomes a practical alternative.
The third variable is the execution speed of Canada's defense spending increases. If the gap between the 4% of GDP target and the actual pace of procurement and force integration [13] is not narrowed, the declaration of reducing defense dependence on the US risks remaining mere political rhetoric.
The fourth variable is the sustainability of Canadian domestic public opinion. The current hardline stance is backed by overwhelming public opinion of 64% and 76% [3]. Whether this public opinion is maintained even if economic pain from tariffs is prolonged will determine the Carney government's room for maneuver in negotiations.
III. Final Recommended Responses
Comprehensive Recommended Responses and Action Plans
1. Comprehensive Assessment and Recommended Responses
Prime Minister Carney's remarks signal that Canada has redefined its relationship with the United States as a "subject of risk management" rather than an "alliance." Although Carney himself drew the line by calling it a "tail risk," the very disclosure that the government actually reviewed the possibility of military action is already a political act [1][4]. Rather than a rhetorical defense in response to President Trump's "51st state" remark, this should be viewed as part of a structural shift, given that Canada is simultaneously increasing its defense spending and building diversification channels with the EU, Vietnam, and China [6][13][14].
In its previous analysis, the EAI projected a 55% probability that Canada-US relations would enter a "prolonged middle ground," rather than a complete breakdown or a comprehensive settlement [3]. These remarks demonstrate that this middle ground has moved beyond a mere extension of trade friction into a phase that includes the collapse of security trust. The South Korean government and businesses need to reevaluate Canada not as a fixed category of "US ally," but as a middle-power actor actively redesigning its relationship with the United States.
The recommended response consists of three prongs. First, South Korean companies should position themselves as early partners to meet the Canadian government's demands for defense procurement, critical minerals, and supply chain diversification. Since Prime Minister Carney explicitly mentioned South Korea as a target for expanding cooperation [1], this is likely to lead to actual procurement processes rather than remaining mere rhetoric. Second, South Korean companies operating North American supply chains via Canada must reassess logistics and customs risks in the event that US-Canada tariff conflicts reignite. Finally, at the government level, South Korea should establish cooperation channels in the defense and shipbuilding sectors in advance, aligned with Canada's defense spending increase schedule (targeting 4% of GDP by 2030) [13].
2. Short-, Medium-, and Long-Term Action Plans
Short-term (3–6 months): The priority is to verify whether Prime Minister Carney's mention of South Korea translates into a substantive cooperation agenda. Through channels of the Ministry of Foreign Affairs and the Ministry of Trade, Industry and Energy, South Korea should identify at an early stage the specific details of Canada's envisioned "reduction of defense dependence on the US," namely procurement items and timelines. At the same time, information sessions on entering the Canadian market should be organized for domestic defense, energy, and critical mineral companies to accelerate their response.
Medium-term (6 months–2 years): South Korea should seek multilateral frameworks in which it can participate at a time when Canada's process for joining the EU as an associate member coincides with its defense spending increase schedule. As the CFR pointed out, Prime Minister Carney is expected to continue utilizing the UN stage to expand partnerships [5]. Therefore, during this period, it would be advantageous to adopt a strategy of integrating South Korea-Canada defense and supply chain cooperation into the multilateral networks that Canada is building, rather than pursuing separate bilateral channels. As seen in the case of elevating relations with Vietnam to a strategic partnership [14], Canada exhibits a pattern of upgrading relations with Asian countries in a manner that explicitly states mutual respect for political systems and sovereignty. South Korea can refer to this format to flesh out its framework for cooperation.
Long-term (2 years or more): Whether Canada-US relations remain in the middle ground for the long term or deteriorate further, Canada is expected to structurally reduce its dependence on the United States in defense, energy, and critical mineral supply chains. South Korea needs to preemptively secure its position as an alternative supplier in this trend. However, given that Canada's implementation of defense investment is slower than planned, as pointed out by former Chief of the Defence Staff Eyre [13], it is crucial to align the entry timing of South Korean companies with the Canadian government's actual budget execution schedule.
3. Monitoring Indicators and Trigger Points
The primary indicators are whether Canada-US tariff negotiations resume and whether the Trump administration attempts to impose new tariffs. The PIIE has pointed out that the Trump administration invoked even a "zombie statute" that had already lost its effectiveness to justify tariffs on Canada [2]. Therefore, any recurrence of similar expansions of legal grounds should be viewed as a trigger for reigniting the conflict.
Canada's pace of defense spending and its path toward achieving the 4% of GDP target should also serve as indicators [13]. If execution is delayed compared to the plan, the timing for South Korean companies to enter the market is highly likely to be pushed back as well.
The progress of Canada-EU associate membership negotiations and the follow-up measures of the Canada-China defense dialogue should also be tracked [5][6]. The moment these two channels move beyond a symbolic level and enter the stage of institutionalization is expected to be the turning point where Canada's diversification strategy translates into a practical alternative.
The frequency and intensity of the recurrence of President Trump's "51st state" remark are also important early warning indicators. The moment this rhetoric is coupled with policy implementation (such as tariff expansion or border measures), public opinion within Canada favoring a hardline stance toward the US (64% supporting the reduction of dependence on the US, 76% supporting the suspension of negotiations) [3] is highly likely to solidify further, accelerating the Carney government's diversification policy.
4. Summary and Conclusion
Prime Minister Carney's disclosure of the military risk review is an event that impressed upon domestic and international audiences that Canada no longer assumes the United States to be a safe security partner. This shows that the collapse of trust in the US, which began with tariff conflicts, has spread to the security domain. Canada's response is taking shape through diversification encompassing Europe, China, Vietnam, and South Korea, accompanied by the physical backing of increased defense spending [13][14]. For South Korea, this situation serves as an opportunity to enter Canada's defense and supply chain markets early, while simultaneously acting as a signal to reassess North American supply chain risks. However, considering the EAI's existing assessment that Canadian-style diversification is unlikely to establish itself as a practical alternative in the short term [3][6], it is rational for South Korea's response pace to be adjusted to match the actual budget and institutionalization progress of the Canadian government, rather than moving too far ahead.
References
[5] [Council on Foreign Relations (CFR)] What to Watch for at UNGA 2026
[7] [El Mercurio] Primer ministro de Canadá admite que han evaluado una acción militar de EE.UU.
[11] [Economic Times] Canada has prepared for the unthinkable: A military attack by US
[14] [The Diplomat] Vietnam, Canada Announce Establishment of Strategic Partnership
[15] [The Globe and Mail] Mark Carney’s long-term plans and Canadians’ immediate pain
[16] [The Globe and Mail] Decoding Canada’s military spending
[18] [Die Presse] EU-Kommissarin: „Ja, wir müssen mehr Risiko eingehen“ [premium]
*This text is an AI translation of an original written in Korean. Some translations or nuances may be inaccurate.
This report is an in-depth analysis planned by an EAI researcher, grounded in sophisticated AI-assisted research, and finalized by the EAI researcher.
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