While the dust has yet to settle on the detention of Venezuelan President Nicolás Maduro, US President Donald Trump’s pivot toward Greenland, within twenty-four hours of that operation may appear as a tactical diversion. Yet viewing it as mere distraction overlooks a long- standing strategic ambition. Trump’s desire to bring Greenland under American control is not new; it has been consistently articulated as a core geopolitical objective.
A Strategic Chokepoint
Although Trump frames foreign policy through transactional instincts, Greenland represents far more than a property negotiation. In Washington’s strategic calculus, the island is a geopolitical necessity. Positioned between North America and Europe, Greenland anchors the GIUK gap (Greenland, –Iceland, –UK), a critical chokepoint in NATO strategy. With Russia expanding its Arctic military presence and China declaring itself a “Near-Arctic State,” Greenland has moved to the centre of twenty-first-century power competition.
The island is also pivotal to North America’s missile defence architecture. Trump’s proposed “Golden Dome” system envisages expanded sensor and interceptor infrastructure in Greenland, building upon the existing Pituffik Space Base (formerly Thule). Direct sovereignty would allow Washington to move from limited alliance-based presence to integrated, sovereign control of Arctic defence infrastructure.
Beyond security, Greenland’s economic value is substantial. Melting ice is making access to vast rare earth element (REE) reserves, estimated at 1.5 million tonnes, more feasible, potentially reducing global dependence on China. The US Geological Survey estimates 31 billion barrels of oil-equivalent hydrocarbons along Greenland’s northeastern coast, alongside gold, uranium, iron, and zinc. Control over Greenland would therefore strengthen American access to strategic resources central to green energy and advanced technology supply chains.
In sum, Trump’s Greenland project reflects a multi-layered strategy combining security integration and resource geopolitics.
The Legal Question
Yet strategic rationale does not resolve the legal question. The modern international order is grounded in sovereignty, self-determination, and territorial integrity.
How compatible is American acquisition of Greenland with these principles?
Trump’s preferred pathway has been consensual purchase. Historically, territorial acquisition by agreement is lawful. The Louisiana Purchase (1803), Alaska (1867), the Gadsden Purchase (1854), and Denmark’s sale of the US Virgin Islands illustrate precedents of territorial transfer.
However, Greenland presents a different legal reality. Under the 2009 Greenland Self-Government Act, Greenlanders are recognised as a “people”” under international law, with the right to determine their political status. Denmark does not possess absolute ownership; it maintains a constitutional relationship within the “Unity of the Realm.” The authority to decide Greenland’s future rests with its people, not Copenhagen. Therefore, Denmark cannot legally “sell” Greenland without Greenlandic consent.
Not for Sale, but Open for Cooperation
Regarding Greenland’s own stance, despite Trump’s long-standing desire for acquisition, Greenlandic officials have consistently rejected total US sovereignty while remaining open to mutual cooperation. The phrase “not for sale, but open for business,” which has served as the Ministry of Foreign Affairs’ motto since 2019, was updated in 2026 by Prime Minister Jens-Frederik Nielsen in more diplomatic yet equally sharp terms: “Greenland does not wish to be governed by the US or to be part of the US. We are a people; we are a democracy.” Similarly, statements by former Prime Minister Múte Bourup Egede in March 2025 echoed this sentiment: “Kalaallit Nunaat (Greenland) belongs to us. We do not wish to be Americans or Danes; we are Kalaallit. We will decide our own future.”
Ultimately, it is legally impossible for Denmark to transfer Greenland to the US without the political will of the Greenlandic people, and it is evident that they—at least for now—do not consent to American sovereignty.
But what of a scenario where Washington disregards consent entirely? Such a move would be more than mere diplomatic discourtesy; it would constitute a direct assault on the foundations of the modern international legal order and a step towards a new era of colonisation. When Washington’s ambitions transition from a declaration of intent to political and economic coercion, they begin to violate international law across three fundamental pillars:
- The Prohibition of the Threat or Use of Force (UN Charter Art. 2/4): The UN Charter serves as the foundational pillar of the contemporary international legal order, explicitly prohibiting not only the use of force but also the threat of force against the territorial integrity or political independence of any state under Article 2(4). While the core of this prohibition is indisputable, the precise legal threshold of what constitutes a ‘threat’ remains a subject of significant doctrinal debate. It is well-established that an explicit ultimatum involving military action falls squarely within this ambit; however, the status of economic and political pressure is more nuanced. In the landmark Nicaragua v. United States (1986) case, the International Court of Justice (ICJ) adopted a restrictive interpretation, ruling that economic sanctions or diplomatic pressures do not, in isolation, constitute the ‘use of force’. Nevertheless, legal scholars argue that when such pressures reach a level of coercion that effectively vitiates a state’s sovereign will—compelling it to act against its fundamental interests in a manner it otherwise would not—the threshold of Article 2(4) may be breached. Regarding the Greenland context, a crucial distinction must be maintained: while standard diplomatic manoeuvring may remain within the realm of political pressure, any rhetoric that implies a withdrawal of security guarantees or leverages military alliances—such as ‘selling’ the territory as a condition for continued NATO protection—crosses the line into an unlawful threat of force. This would constitute a violation of a peremptory norm –jus cogens. Furthermore, according to ICJ jurisprudence, particularly in the Legality of the Threat or Use of Nuclear Weapons Advisory Opinion (1996), a threat is legally actionable only if it is ‘credible’ and ‘imminent’. In this regard, it is not far-fetched to argue that the ‘purchase’ rhetoric of the Trump era, when coupled with the intensified frequency of military exercises in the Arctic, meets this threshold of credibility, signalling a shift from mere political posturing to a legally cognisable threat
- The Principle of Non-Intervention and Political-Economic Coercion: Beyond the prohibition of the threat or use of force, political and economic coercion can, in their own right, constitute a breach of international law if employed to interfere in the internal affairs of a sovereign state. This is rooted primarily in the principle of non-intervention, which finds its normative expression in Article 2(7) of the UN Charter. While this provision formally binds the United Nations as an organisation, it reflects a foundational rule of customary international law governing interstate relations, as confirmed by the ICJ in the Nicaragua case. In essence, international law prohibits a state from utilising economic or political pressure to coerce another state into making decisions that fall within its sovereign jurisdiction. Thus, any US threats regarding customs tariffs or signals of economic sanctions aimed at compelling the transfer of Greenlandic territory would breach this principle. Such actions also contravene the UN General Assembly’s Declaration on Friendly Relations (Resolution 2625), which categorically dictates that ‘no State may use or encourage the use of economic, political or any other type of measures to coerce another State in order to obtain from it the subordination of the exercise of its sovereign rights.’ Within this legal framework, when economic pressure is designed to ‘subordinate’ the sovereign will of Denmark or Greenland, it ceases to be mere diplomatic posturing and matures into an unlawful act of intervention.
- Violation of the Right to Self-Determination: Any coercive transition to US sovereignty without the explicit consent of the Greenlandic people—recognised as a ‘separate people’ since 2009—would constitute a grave usurpation of their right to determine their own political status. Under international law, this right- the right to self-determination- is not merely a political principle but a peremptory norm, as reaffirmed by the ICJ in the East Timor (1995) and Chagos Archipelago (2019) cases. Crucially, a distinction must be drawn between internal self-determination—Greenland’s existing right to autonomous governance within the Danish Realm—and external self-determination, which governs any potential transfer of title or independence. For such a transition to be legally valid, it requires a ‘free and genuine’ expression of will, a threshold established in the Western Sahara Advisory Opinion (1975). Any referendum conducted under the shadow of economic coercion or military posturing would fail this ‘genuine’ requirement, rendering the resulting consent factually and legally ‘defective.’ Furthermore, should Washington extract a seemingly ‘consensual’ treaty through such pressure, that treaty would be legally void. Article 52 of the 1969 Vienna Convention on the Law of Treaties (VCLT) explicitly states that ‘a treaty is void if its conclusion has been procured by the threat or use of force.’ In the eyes of modern international jurisprudence, a contract signed under duress—where the ‘will’ of the people is bypassed by the ‘coercion’ of a superpower—does not constitute a legal transfer of title; it constitutes an unlawful annexation.
Conclusion
Greenland is a strategic asset in Arctic geopolitics, but its people are rights-bearing subjects under international law. Acquisition without their free and genuine consent would constitute not merely diplomatic overreach but a breach of core legal principles. The question is therefore larger than Greenland itself: it concerns whether the international order can withstand the pressures of renewed Great Power politics without sacrificing the rule of law.
