Nordic Nukes: Seeking Strategic Agency in Uncertain Times

Following French President Emmanuel Macron’s March 2 speech at Île-Longue, most Nordic countries—Sweden, Denmark, and Norway—have expressed interest in an additional European nuclear protection, to complement U.S. extended deterrence. For the Nordics, once the world’s most vocal advocates for nuclear disarmament, the recent transition to a formal reliance on nuclear deterrence, and primarily U.S. extended deterrence, has been a profound strategic coming of age. Yet this pivot has birthed a unique dilemma: These states have anchored their survival to NATO’s nuclear posture at the exact moment the U.S. National Defense Strategy has begun to increasingly prioritize domestic interests over international commitments.

Consequently, the nuclear debate in the Nordic countries has reached a historical fever pitch. Spanning the traditional NATO umbrella, the provocative concept of an indigenous “Nordic Nuke,” and the European path of Macron’s forward deterrence, these discussions signal a move beyond traditional disarmament to champion a more autonomous form of strategic thinking. This article explores these evolving options and how they might provide the Nordic countries with greater agency in an increasingly uncertain nuclear landscape.

Nordic Nuclear Trajectories: From Disarmament Champions to Deterrence Realists

For decades, the Nordic region’s security architecture was defined by a delicate balance: While Norway and Denmark relied on NATO’s nuclear umbrella, nonaligned Sweden and Finland acted as global champions for arms control and nonproliferation. Even as NATO members, Oslo and Copenhagen maintained strict “peacetime bans” on nuclear stationing to avoid provoking Moscow—even though it was revealed in the 1990s that Denmark secretly allowed U.S. storage of nuclear weapons in Greenland from 1958 to 1965. Meanwhile, Stockholm and Helsinki leveraged their neutrality to lead initiatives like the 1975 Helsinki Accords and the 2013 humanitarian impact conference, framing the Nordics as the moral conscience of the nuclear order. This political positioning was reinforced by strong popular support for unilateral disarmament across the region, particularly in Norway and Denmark.

The 2022 Russian invasion of Ukraine shattered this equilibrium. Finland and Sweden’s subsequent NATO accession was characterized by a “no preconditions” strategy, prioritizing immediate Article 5 guarantees over traditional caveats. In Helsinki and Stockholm, governing Social Democratic parties—once the ideological backbone of the disarmament movement—orchestrated rapid internal reviews to align with the alliance’s nuclear posture. In Sweden, then–opposition leader Ulf Kristersson publicly pledged support for following the Norwegian and Danish model of prohibiting nuclear weapons in peacetime to build domestic consensus. The speed of the process—spanning only from February to May 2022—deliberately prioritized a swift accession, leaving little space for opposition movements to organize for a deep public debate on the nuclear implications of membership. This marked a profound shift in the region from being the world’s fiercest advocates for disarmament to becoming frontline states in a nuclear alliance.

Today, the Nordic region is in a state of legislative and political flux. While Norway, Denmark, and Sweden maintain their non-stationing policies through political commitments and defense cooperation agreements, these remain executive policy choices rather than hard law. Finland stands as the starkest exception, with its 1987 Nuclear Energy Act that explicitly criminalizes the import and transport of nuclear weapons. However, the current government’s proposal to repeal these restrictions signals a move toward an alignment with other NATO members in the region—a move designed to maximize preventative deterrence that has instead sparked a domestic political debate. It is worth noting that leaders who once avoided the topic now speak openly of nuclear realities: Finnish President Alexander Stubb has highlighted the increasing role of nuclear assets, and Swedish Prime Minister Ulf Kristersson has indicated openness to hosting them in wartime scenarios.

This internal realignment is colliding with a fundamental shift in Washington. Following the June 2025 NATO Summit in The Hague—where President Trump demanded allies reach a 5 percent GDP defense spending target by 2035—the subsequent 2026 Greenland crisis acted as a strategic shock to the Nordic region. By threatening military force to annex Danish territory, the United States transformed from an unconditional protector into an unpredictable strategic risk. For the Nordics, the U.S. nuclear umbrella, while still present, is no longer perceived as an absolute or unconditional guarantee. This erosion of trust has turned strategic agency from a theoretical goal into an existential necessity, prompting a search for more predictable forms of European security.

Options on the Table: Navigating the New Deterrence Landscape 

In response to heightened geopolitical tensions following Russia’s invasion of Ukraine and growing uncertainty about U.S. security guarantees, Nordic countries are now actively debating three main strategic options.
 

1. Doubling Down on U.S. Security Guarantee

The foremost strategic priority for the Nordic countries remains the preservation of U.S. engagement in NATO, specifically the credibility of the U.S. extended nuclear guarantee. This focus stems from a stark military reality: Europe remains structurally dependent on U.S. nuclear capabilities. This deterrence is embedded in a dense network of transatlantic institutions and operational arrangements that underpin its durability. Even amid shifting U.S. domestic politics, many in Washington argue that a stable Europe is a prerequisite for a pivot to the Indo-Pacific. This reinforces the Nordic view that extended deterrence is a mutual strategic interest rather than a liability, making sustained U.S. leadership the indispensable cornerstone of regional security.

Within this framework, Nordic states have solidified their roles as essential strategic partners. Their advanced capabilities, Arctic warfare expertise, and proximity to Russia’s Northern Fleet strengthen the alliance’s posture. This commitment is reflected in full institutional support for NATO’s nuclear policy, as all Nordic members now participate in the Nuclear Planning Group.

Norway continues to play a sophisticated balancing act, marrying fierce alliance solidarity with a commitment to transparency. The Norwegian National Security Strategy and the Long-Term Defence Plan for 2025–2036 explicitly reaffirm that that while nuclear weapons exist, a mix of forces remains essential. Simultaneously, Oslo promotes arms control and nonproliferation as core elements of its security policy, enabling it to balance participation in NATO’s nuclear framework with a long-standing domestic commitment to restraint.

For Finland, the need to counter Russian nuclear signaling and the inherent asymmetry of a nonnuclear state facing a revisionist neighbor have motivated a rapid integration into NATO structures. Finland’s recent contribution of F/A-18 Hornet aircraft and personnel to the Steadfast Noon 2025 nuclear deterrence exercise served as a powerful signal of both military interoperability and political resolve.

Denmark has followed a similar trajectory; despite its decades-old nonnuclear policy, its recent participation in Steadfast Noon and its Security and Defence towards 2035 strategy underscore a newfound urgency. Copenhagen’s strategy explicitly highlights the need for advanced nuclear crisis management expertise at both military and civilian levels.

Ultimately, this first option represents a collective Nordic effort to reinforce U.S. commitment through deeper integration. By demonstrating significant burden-sharing and avoiding unilateral actions that could fragment the alliance, the Nordic states hope to anchor Washington to Northern Europe. While Sweden and Finland have considered adopting peacetime restrictions similar to the Norwegian and Danish models, the overarching trend is toward a “harder” form of alignment with NATO’s deterrence requirements.
 

2. The European Insurance Policy

A second, newer path involves exploring European nuclear options as an additional backstop. The search for a European complementary security insurance gained decisive momentum with the 2025 Northwood Declaration, which committed London and Paris to enhanced nuclear coordination while maintaining national command.

Following the March 2, 2026, speech at Île-Longue, Macron’s assertion that France’s “vital interests” possess a European dimension has gained renewed urgency, particularly through his proposal for a “forward deterrence” (dissuasion avancée) model unveiled at Île-Longue. The address catalyzed a notable strategic shift in Stockholm and Copenhagen, which signaled their willingness to join French nuclear dialogues. While Stockholm remains firm that it has no intention of hosting nuclear weapons in peacetime, its historical nuclear research legacy and sophisticated defense industrial base make it a uniquely relevant partner. Some analysts suggest that Sweden’s technological expertise could allow it to play a supporting role in a future Northern European deterrence framework integrated with French or British assets. Even Oslo, traditionally the most Atlanticist of the three, has begun signaling an openness to this framework, leaving Finland as the sole regional holdout focused exclusively on the NATO nuclear track.

Ultimately, for the Nordics, engaging with Paris and London provides a way to reclaim strategic agency. By fostering closer intra-European cooperation, they are not seeking a substitute for the transatlantic guarantee, but rather a more predictable, localized backstop in an era of deepening geopolitical uncertainty.
 

3. Indigenous Capabilities, or the “Nordic Nuke” Debate

A third option—the development of an indigenous Nordic nuclear capability—has recently gained traction in academic and expert debate. While it remains a conceptual hedge rather than active policy, its resurgence signals a profound reassessment of the region’s security assumptions. Proponents, most notably former Danish Foreign Minister Jeppe Kofod, argue that a Nordic nuclear deterrent is becoming a “strategic necessity” to ensure regional survival in an era when the U.S. umbrella is perceived as functionally hollow. Today’s proponents envision a cooperative regional framework where Nordic states share financial, technological, and operational responsibilities to maximize strategic autonomy.

The primary function of this Nordic nuke debate is not immediate weaponization, but strategic signaling. However, it is worth noting these debates dismiss the political, technical and financial cost that a nuclear program would impose on Nordic countries if they were to choose that perilous path. Legally, any move toward an indigenous arsenal would require a withdrawal from the Treaty on the Non-Proliferation of Nuclear Weapons; a move that would shatter the Nordics’ international standing and create deep fractures within alliances. While some, such as analyst Johannes Kibsgaard, suggest that a “cooperative nuclear hedge” could potentially be integrated into a NATO framework, this interpretation remains highly contested. Technically, while Sweden has a history of pursuing a nuclear weapons program in the 1960s, establishing an independent value chain to produce nuclear weapons would require decades of investment and a level of political consensus that does not yet exist in any Nordic country.

Ultimately, the indigenous option remains a theoretical fallback. The persistence of this debate confirms that the Nordic states are no longer content to be subjects of a shifting nuclear order but are instead laying the intellectual and political groundwork to become its active architects.

Strategic Maturity: Reimagining the Nordic Contribution to Allied Security 

Nordic countries currently face a strategic paradox: They must embrace NATO’s nuclear umbrella, the cornerstone of collective security, precisely when the credibility of the U.S. security guarantee is being questioned. This dilemma necessitates cautious and calibrated steps toward nuclear deterrence, avoiding both the radicalism of the abolitionist movement and the extreme risk of proliferation. Given their long-standing commitment to disarmament and their robust contributions to NATO’s defense posture, Nordic states are uniquely positioned to offer constructive proposals to European nuclear debates. 

First, Nordic countries could lead the defense of NATO’s nuclear burden-sharing arrangements, which are increasingly under fire from China and Russia in international disarmament forums. While the United States has signaled no intent to retreat from NATO’s nuclear mission, official U.S. strategic documents and statements have increasingly emphasized the conventional aspects of burden sharing, assuming the nuclear dimension remains a settled matter. In this context, the Nordic states are uniquely positioned to translate the same security imperatives that shifted their own domestic opinion toward a nuclear alliance into a broader NATO narrative: proving that robust burden sharing in the face of an aggressive neighbor is actually the most effective tool for preventing further regional proliferation. By doing so, they can engage in a form of intellectual burden sharing, and take up policy leadership in nonproliferation forums at a time when U.S. diplomatic capacity is overextended. The nuanced Nordic perspective is likely to resonate more effectively with the Non-Aligned Movement countries, which has been a primary target of Beijing’s narratives against NATO. 

Second, the Nordic countries should utilize their existing cooperation frameworks to cultivate a shared strategic culture on nuclear deterrence. Rather than treating nuclear policy as a remote NATO mandate, the region should leverage NORDEFCO to bridge the gap between operational military integration and high-level nuclear doctrine. The unique alignment in military planning in the region—with the consolidation of the Nordic region into a unified NATO theater under Joint Force Command Norfolk, supplemented by the recent suite of bilateral defence cooperation agreements with the United States—could contribute to forging a common perspective on how nuclear deterrence interacts with conventional dynamics in the region. Furthermore, in NATO, the perspectives of Finland and Sweden as new members is unencumbered by decades of Cold War path-dependency, allowing them to offer more innovative contributions to the alliance’s nuclear posture than established allies might provide. 

Finally, a unified Nordic strategic culture could play a pivotal role in shaping emerging European nuclear options, particularly those spearheaded by France and the United Kingdom. Practical signaling of this cooperation is already visible; for instance, the spring 2025 deployment of nuclear-capable French Rafales to Sweden’s Luleå airbase during exercise Pégase Grand Nord demonstrated a newfound readiness to build a more autonomous and resilient European deterrence strategy. In the framework of their nuclear dialogues with France, Nordic countries could also leverage the “total defence” model, which entails a high level of societal resilience from peacetime to conflict, to contribute to European reflections on escalation management under the nuclear threshold.

Nordic governments have embraced deeper integration into NATO’s nuclear architecture at a moment of profound systemic tension. This transition has carved out a unique role for the region: acting as a bridge between a foundational commitment to disarmament and a cold-eyed pragmatism toward nuclear deterrence. If they can successfully navigate their domestic political sensitivities, the Nordics will offer a vital new perspective to nascent European security initiatives, demonstrating that even the most reluctant nuclear allies can become the most effective architects of a multilayered deterrence framework.

Astrid Chevreuil is a visiting fellow in the Europe, Russia, and Eurasia (ERE) Program at the Center for Strategic and International Studies (CSIS) in Washington, DC. Gine Lund Bolling is a former visiting fellow in the ERE Program. Sara von Bonsdorff is a former intern in the ERE Program.