Deterrence does not rest solely on possessing nuclear weapons. It also depends on the assurance that those weapons cannot be neutralized, constrained, or rendered ineffective by an adversary’s ability to maneuver, surveil, or strike first. Geography, therefore, matters. In the emerging strategic environment, Greenland occupies one of the most consequential geographic positions in the world.

Denial as the Foundation of Nuclear Survivability

The survivability of U.S. nuclear forces, particularly the sea-based leg of the nuclear triad, is the cornerstone of strategic stability. Ballistic missile submarines (SSBNs) provide the most secure retaliatory capability precisely because they operate undetected at sea. But stealth is not automatic. Submarines must transit known maritime corridors to reach patrol areas, and those corridors create opportunities for adversary interference.

For U.S. and allied forces operating in the Atlantic and Arctic, two choke points are decisive: the GIUK Gap (Greenland–Iceland–United Kingdom) and the Bear Gap between Greenland and Svalbard. These routes connect the Arctic Ocean to the North Atlantic and serve as the primary pathways for submarines moving between bastion areas and open-ocean operating zones.

If Russian or Chinese submarines could transit these gaps freely, they would be able to threaten NATO SSBNs, target transatlantic sea lines of communication, and position themselves for nuclear or conventional strikes against NATO territory and U.S. nuclear forces. Denying that access—rather than reacting after the fact—is what preserves nuclear survivability. Greenland makes such denial far more feasible.

Greenland as a Strategic Gatekeeper

Greenland’s location enables persistent surveillance, early warning, and anti-submarine warfare operations across the Arctic–Atlantic interface. Sensors, airfields, space and radar infrastructure, and command-and-control nodes associated with Greenland enable the United States and NATO to monitor adversary movements and constrain their ability to maneuver undetected.

This is not about tactical confrontation; it is about strategic denial. Greenland’s geography makes it exceedingly difficult for Russian or Chinese forces to move quietly from the Arctic into the Atlantic, increasing the likelihood that such efforts would be detected, tracked, and, if necessary, intercepted. When combined with American technology, Greenland adds uncertainty, constrains their options, complicates operational planning, and reduces incentives for escalation.

Russia’s Arctic Strategy and the Olenya Complex

Russia’s own posture reinforces Greenland’s importance. Moscow has invested heavily in the Arctic, operating 32 bases, expanding air and missile defenses, and increasing submarine activity across the High North. The Kola Peninsula hosts a substantial portion of Russia’s nuclear forces, supported by infrastructure such as the Olenya nuclear weapons storage facility, which underpins long-range aviation and missile operations.

Russia’s objective is twofold: to shield its own nuclear forces within a protected Arctic bastion, and to enable submarines and aircraft to push outward into the Atlantic when required. Those outward movements would be designed to threaten NATO’s reinforcement routes, hold allied territory at risk, and directly threaten U.S. strategic forces and American cities.

By enabling the U.S. and NATO to better monitor and deny access through the Arctic gaps, Greenland limits Russia’s ability to mobilize and deploy 40 percent of its submarine force. This denial mission directly strengthens Euro-Atlantic security by reducing the coercive value of Russian nuclear signalling or capacity for destruction.

China, the Arctic, and Global Deterrence

Although China is not an Arctic power by geography, it increasingly behaves like one strategically. Beijing’s naval expansion and interest in Arctic routes reflect its ambition to operate on a global scale. Chinese submarines operating in cooperation with Russia, or benefiting from shared intelligence and surveillance, could complicate the maritime balance in the North Atlantic.

Preventing Chinese submarines from accessing these waters is therefore as important as containing Russian forces. Even a limited Chinese presence would require diverting allied assets and introducing new strategic risks. Greenland helps pre-empt that outcome by reinforcing allied control over Arctic approaches and denying adversaries the ability to open a northern axis of competition.

This denial function links Greenland directly to Indo-Pacific security. The same U.S. nuclear forces that deter conflict in Asia depend on freedom of manoeuvre and survivability in the Atlantic and Arctic. If those forces are threatened in one theatre, credibility erodes in all others.

Air, Missile, and Early Warning Dimensions

The Arctic is also a critical domain for air and missile operations—America’s planned “Golden Dome.” Long-range bombers and ballistic missiles generally follow polar trajectories to maximize range and payload and minimize warning time. Greenland’s position enables early detection, tracking, and integration into broader air and missile defense architectures.

By denying adversaries access to Arctic airspace, Greenland reinforces strategic stability by reducing incentives for first-strike calculations over the North Pole. This capability is essential in an era of increasingly compressed decision timelines.

Conclusion

Greenland matters because it enables strategic denial by denying Russian and Chinese submarines, aircraft, and missiles access through the Arctic and North Atlantic gaps that connect global theatres. That denial preserves the survivability of U.S. nuclear forces, protects allied homelands, and sustains the credibility of extended deterrence across both the Euro-Atlantic and Indo-Pacific regions.

In an age defined by competition over access and geography, Greenland is not peripheral but essential to maintaining the balance of power and preventing great-power conflict.

Natalie Treloar is the Australian Company Director of Alpha-India Consultancy, a Senior Fellow at the Indo-Pacific Studies Center (IPSC), a Senior Analyst at the National Institute for Deterrence Studies (NIDS), and a member of the Open Nuclear Network. Views expressed in this article are the author’s own.

Greenland, Strategic Denial, and the Survivability of U.S. Nuclear Forces was originally published on Global Security Review.

That contradiction has come into sharp relief during the presidency of Donald Trump, whose blunt interest in Greenland exposed what European diplomacy had long obscured. The controversy was framed as eccentricity or provocation, but the underlying grievance was familiar. For decades, the United States has underwritten European security while European governments reduced their defense investments in favor of generous welfare systems and subsidized industry, confident that the American half of the alliance would absorb the risk. The Greenland crisis has simply made that imbalance visible.

Greenland’s Strategic Reality

Greenland occupies a unique strategic position. It sits in the western hemisphere astride the Arctic approaches to the “GIUK Gap,” hosting critical space and missile-warning infrastructure essential to NATO’s early-warning architecture. The 2004 Defense Greenland Agreement between the United States and Denmark, Amending and Supplementing the Agreement of April 27, 1951, explicitly limits the US defense area in Greenland to Thule (Pituffik) Air (Space) Base only.

With Arctic sea lanes opening and undersea infrastructure becoming a focal point of competition, Greenland’s strategic importance is no longer peripheral but central. The question now confronting Europe is whether the small Kingdom of Denmark and, by extension, Europe, can demonstrate even minimal sovereignty over a territory it insists is non-negotiable but has left undefended for some 250 years.

Article 3 of the NATO Treaty states: “In order more effectively to achieve the objectives of this Treaty, the Parties, separately and jointly, by means of continuous and effective self-help and mutual aid, will maintain and develop their individual and collective capacity to resist armed attack.” Put plainly, Denmark is obligated to maintain—on its own and on a continuous basis—the capacity to defend all its territory. By that standard, Denmark has failed to meet its Article 3 responsibilities for a very long time, if it ever has.

Despite its strategic importance, Greenland remains vulnerable and economically neglected. This is not an accident or a bureaucratic oversight. It is the result of a long-standing assumption—that the United States would indefinitely guarantee European sovereignty and sustain its social-economic model. That assumption no longer holds. Strategic competition is shifting away from open confrontation toward constant pressure, probing actions, and fait accompli. In this world, sovereignty is not something you can merely declare. It is something you must demonstrate.

Trump, Europe, and the Sovereignty Question

Trump’s narrative about Greenland was widely dismissed as transactional or unserious. Stripped of tone, however, the message was structural: As the Arctic presents opportunity, Greenland is even more strategically vital to North American security than ever before, and someone must take responsibility for securing and developing it.

This tension among NATO allies reflects a broader post–Cold War pattern. Europe expanded its regulatory, economic, and political influence while allowing NATO military funding and capability to atrophy. The resulting system elevated process, norms, and legalism over hard power security, sovereignty, and deterrence.

The renewed United States demand for Greenland exposes the limits of that model. If Denmark cannot even mount a minimal defense of its own territory, the problem is not American overreach, but European credibility.

The UK Corollary

In a striking act of geopolitical idealism, the United Kingdom has agreed to cede sovereignty over Diego Garcia to Mauritius—an “own goal” that harms US interests. Long regarded as an “unsinkable aircraft carrier,” Diego Garcia has been a cornerstone of US and UK power projection across the Middle East, East Africa, South Asia, and beyond for decades.

After years of legal and diplomatic pressure—culminating in adverse rulings from international courts and the United Nations—the UK concluded that continued unilateral control of the Chagos Archipelago was politically unsustainable in this rules-based international order. In 2024, London agreed to transfer sovereignty to Mauritius, a state increasingly influenced by Beijing, while attempting to preserve military access through a long-term, UK-funded lease.

On paper, operations continue. Leverage shifts from occupant to owner. Sovereignty matters: once surrendered, access rests on political permission rather than power. A future Beijing-aligned Mauritius could abrogate agreements or revoke leases, leaving the US and UK strategically stranded, “out of runway” and out of business in the Indian Ocean.

Like Diego Garcia, Greenland’s strategic value lies in assured access. Trusting that allies will always act in America’s best interest is folly. Access without ownership is always conditional; sovereignty without power is fragile. Both cases reveal the same risk—vital territory left exposed at a moment when great-power competition demands clarity, presence, and resolve.

Sovereignty Requires Adequate Organic Defense

Defending Greenland does not require national militarization on Cold War terms. It does not require large permanent formations or aggressive posturing. But it does require capability, presence, and integration of real forces tied to real geography. The fantasy of the [European] Liberal [global] Rules-based order is no longer sufficient alone.

A credible defense posture requires permanent ground, air, and naval forces. Presence must be sufficient to assert territorial control, secure the Arctic approaches, and protect key infrastructure. Additionally, it requires fifth-generation airpower, supported by NATO enablers sufficient to project air sovereignty and assert control over the airspace of the GIUK, along with integrated maritime and subsurface awareness to control approaches, advanced air and missile defense for critical nodes, and the logistics infrastructure required to sustain operations in an Arctic environment.

This is not an escalation; it is the minimum viable defense posture for the territory Denmark claims sovereignty over, NATO depends upon, and the Western Hemisphere demands. Anything less than that is not restraint; it is abdication.

What Denmark Can Do

For Denmark to retain its kingdom, it must fervently acknowledge that China and Russia are expanding their Arctic ambitions and that continuing to ignore or neglect this threat risks losing Greenland to another great power’s orbit. Denmark does not need to defend Greenland alone, but it must lead and meet its Article 3 responsibilities. Sovereignty cannot be subcontracted. First, Denmark must accept that a visible, persistent presence is non-negotiable. A battalion-sized force and a fighter squadron on Greenlandic soil are not a burden; they are a declaration of responsibility.

Second, Denmark must align force posture with geography. Arctic defense is not a side mission; it is central to Denmark’s strategic responsibilities and credibility. That requires prioritizing basing, sustainment, and readiness over symbolic deployments there or elsewhere.

Third, Denmark must integrate defense with economic development. Resource extraction, energy production, and infrastructure are not separate from security; they are its foundation. Without an economic base, defense remains episodic and less affordable. For the collective West, energy and critical element security is national security. If Denmark cannot execute these steps—even with allied support—then sovereignty is no longer exercised; it is merely asserted.

How Europe Can Contribute Without Posturing

Greenland offers Europe an opportunity to demonstrate what regional shared deterrence looks like. Contributions need not be equal in scale, but they must be meaningful in effect. Rotational air defense units, maritime patrol aircraft, icebreaking capacity, logistics support, and infrastructure investment tied directly to defense requirements would materially strengthen deterrence without grandstanding.

This is where Europe’s economic power must finally align with its strategic claims. Shared deterrence is not about symbolism or declarations. It is about complementary capability and sustained commitment.

Can Europe Move Fast Enough?

The decisive variable is time. Ten-year roadmaps and aspirational targets are irrelevant. Greenland’s exposure is immediate. The longer Europe delays, the more it reinforces the perception that sovereignty exists only on paper. Delay only serves to validate President Trump’s strategic demand.

Credible deterrence must begin within weeks, not months or years. Initial deployments need not be perfect, but they cannot be symbolic political statements devoid of the credible military capacity required for the mission. They need to be visible, permanent, and expandable.

The Consequences of Failure

Failure in Greenland would reverberate far beyond the Arctic. If Denmark cannot defend Greenland with allied assistance, then European claims of strategic autonomy collapse and NATO’s credibility fractures geographically. The United States will either act unilaterally or disengage selectively. Resource development will proceed without European leverage. Most damaging of all, failure would confirm a lesson Europe can no longer afford: that idealism and process cannot substitute for balance-of-power realism, and that international norms cannot enforce themselves. Where previous US presidential administrations relied on alliances, basing agreements, and quiet influence, President Trump has framed the issue in transactional terms: if Greenland was strategically vital, someone had to take responsibility for securing and developing it.

Conclusion

Greenland is not a crisis invented in Washington. It is the result of allied neglect and free riding. Persistent underinvestment in defense, miscalculation of threats, and a readiness among many allies to subordinate their sovereignty to international norms have produced a growing crisis of confidence in the United States. This can only be reversed with real power projection and a NATO commitment to peace through strength.

Denmark does not need to match American power. It needs to demonstrate agency, urgency, and empathy. Denmark and greater NATO must listen to its most powerful ally and address its security concerns with great alacrity. Rather than escalating the rhetoric, Denmark should admit its negligence and mitigate the shortfall now. Europe does not need to replace the United States or drive it out of the alliance. It needs to stop pretending that sovereignty is cost-free or that it can be reliably substituted with treaties in perpetuity.

This President demands more of the alliance to defend America’s northern approaches. If Denmark and the rest of NATO cannot meet that demand, the United States will. What is being asked is reasonable. The Arctic is now NATO’s second front. If Europe cannot meet that demand here, it has become sovereignty insolvent and should stop speaking of autonomy elsewhere. Because in the end, reality does not respond to intention, only to real and persistent power.

Col (Ret.) Kirk Fansher is a senior fellow at the National Institute for Deterrence Studies. Col (Ret.) Curtis McGiffin is vice president of education at the National Institute for Deterrence Studies. Views expressed by the authors are their own.

Can Denmark Defend Greenland from Trump? was originally published on Global Security Review.