Donald Trump wants Greenland. Not for its ice sheets, Inuit culture, or midnight sun, but because it is, in his words, “very important for national security.” On its face, the demand sounds provocative, almost absurd. But like many provocations, this one is doing realpolitik work. It exposes how security is manufactured, performed and weaponised in contemporary international politics. Read through the lens of the Copenhagen School of International Relations, Trump’s Greenland fixation is not an oddity. It is a textbook example of securitisation in action.
The Copenhagen School, most closely associated with Barry Buzan and Ole Wæver, rejects the comforting idea that security threats exist objectively “out there” waiting to be discovered. Instead, it holds that security is socially constructed through language. Issues become security threats not because of their inherent nature, but because powerful actors describe them as existential dangers that demand urgent, extraordinary measures. This process is known as securitisation. A “securitising actor”—typically a political leader—frames an issue as a threat to survival, persuades a relevant audience, and thereby legitimises actions that would otherwise be unacceptable within normal politics. The Copenhagen School does not limit security to tanks and missiles. It identifies multiple sectors—military, political, economic, societal, environmental—each with its own logic of threat and vulnerability. Borders, identities, markets, climate, migration and governance can all be rendered matters of security if described convincingly enough. The battlefield is not just territory. It is discourse.
Securitisation is not about solving problems; it is about redefining them. Once something is framed as existential, the rules change and norms bend
Trump’s Greenland rhetoric sits squarely within this framework. By repeatedly arguing that Greenland is “very important for national security” Trump acts as a securitising actor. He links Greenland’s strategic location to broader fears about China and Russia. In doing so, he constructs a narrative in which Greenland is not merely a distant, sparsely populated Arctic territory, but a critical node in a global struggle for power.
Trump does not argue that Greenland is merely useful. He claims it is dangerously exposed. His statement that “there’s not a thing that Denmark can do about it if Russia or China wants to occupy Greenland” is not a throwaway line; it is the heart of the securitising move. It delegitimises Danish sovereignty, portrays Greenland as defenceless, and elevates the United States as the only credible protector. This is classic Copenhagen School logic: construct vulnerability, identify an existential threat, then present extraordinary intervention as the only rational response. In this narrative, buying another country’s territory is not aggression, it is responsibility.
What makes this case particularly striking is that many of the practical security concerns Trump points to are already addressed through existing arrangements. The United States already maintains a military presence in Greenland, including a base with around 150 personnel. Existing agreements allow Washington to expand its presence if needed. From a strictly operational standpoint, U.S. security interests in the Arctic are already safeguarded. Ownership adds little. Control adds symbolism.
And that is precisely the point. Securitisation is not about solving problems; it is about redefining them. By insisting that anything short of outright U.S. ownership is insufficient, Trump attempts to wrench Greenland out of the realm of routine defence cooperation and shove it into the realm of emergency politics. Once something is framed as existential, the rules change. Norms bend. Sovereignty becomes negotiable. What once sounded insane begins to sound “realistic.”
Securitisation, however, is never automatic. It only succeeds if the audience accepts the threat narrative and the exceptional measures it legitimises. In this case, the attempt largely collapsed. Denmark rejected the idea outright. Greenland’s leaders made clear they were not for sale. Allies and commentators treated the proposal as unserious or offensive. The failure matters. One of the Copenhagen School’s most important insights is that securitisation is contingent. If the audience refuses to be persuaded, the move fails.
Still, failure does not mean harmlessness. Even unsuccessful securitisation leaves scars. Trump’s Greenland gambit reinforces the idea that the Arctic is an inevitable arena of zero-sum great-power rivalry. It normalises a transactional, coercive vision of alliances. It quietly erodes the assumption that sovereignty—especially the sovereignty of small states—is sacrosanct when a larger power invokes “national security” loudly enough. It shifts the boundaries of what can be said without consequence.
Most of all, it reminds us that in international politics, language is not ornamental. It is a weapon. To declare something a security issue is not merely to describe the world as it is, but to try to remake it. It is an attempt to shift boundaries of debate, of legitimacy, of what actions are thinkable.
Trump’s proposal to buy Greenland may never come close to realisation. But as a securitising move, it demonstrates how easily the language of “national security” can be mobilised to challenge sovereignty and reframe imperial impulses as prudent defence. The episode is less about the Arctic than about power: who gets to define threats, whose fears count and how far exceptional measures can be pushed before they are resisted.