US and Denmark agree military presence in Greenland

The foreign ministries in Washington and Copenhagen assume they know what the Arctic will require of them: which threats from Russia and China will materialise, on what timetable, and how large a military presence answers them. They do not know. Nobody does, because that knowledge does not yet exist in any mind; it will be produced only by events. The agreement reached on Friday between Donald Trump and Mette Frederiksen, which gives the United States a significant military presence on Greenland, is a decision to commit to a particular answer before the question has been asked.

I do not say this to dismiss the concern. Defence is among the few goods that a government must supply, and the Arctic is becoming more navigable and more contested. A surveillance and basing arrangement between allies is a defensible use of public authority. The difficulty lies in what the arrangement claims to settle. The dispute over whether the United States has obtained “permanent control” over the island is not a quibble about wording. It shows that the two parties left the signing table with different beliefs about what was exchanged. When the central term of a transaction is contested the moment it is concluded, the transaction has not resolved anything. It has postponed a quarrel and given it a legal form.

Consider what a price would ordinarily tell us here. In a market, the cost of holding a piece of land or a harbour tells the holder how much everyone else values the alternatives. A base has no such price. Washington does not pay Copenhagen a rent that rises as the site becomes more valuable, and it does not weigh that rent against the harbour or fishing rights the same land might have served. Instead there is a negotiated bundle whose true cost falls on people who were not at the table. A hunter or fisherman in a Greenlandic town, watching survey crews arrive, holds better information than any delegation about which inlets freeze, which roads wash out, and what a thousand new residents do to a town built for a few hundred. Nothing in the agreement has a channel for that information to reach the people spending the money.

Now the ratchet, which operates without any conspiracy. A significant presence needs runways, fuel, housing, and supply lines, and those need protection, which is the presence’s own justification for growing. Moscow and Beijing, observing a hardened American position, will respond as any rational party would, by strengthening their own. That response then becomes evidence, in the next budget cycle, that the first commitment was too small. Each step is reasonable given the previous one. No one ever votes for the whole sequence, and the sequence is what the island ends up with.

The strongest objection deserves an answer. Hesitation, the objection runs, is itself a decision, and rivals who act while democracies deliberate will take what they want. That is true, and it argues for an arrangement that can act quickly. It does not argue for one that is vague. Speed and clarity are different things, and the vagueness here is what will be expensive. A commitment whose scope is disputed has to be renegotiated under pressure, and whoever is angriest or most hurried on the day of renegotiation holds the advantage. Denmark, a small state with a large ally, is the party more likely to discover this.

The constitutional question is whether there is a general-rule version of this deal. There is, and it is duller than a grand bargain. It would set out in advance what the host may refuse, what the visitor may not do, how disputes are settled, and what happens if either side wants to leave. It would give the people of Greenland, who govern themselves within the Danish realm, a standing right to be consulted rather than a favour granted when convenient. It would tie the size of the presence to observable conditions rather than to anyone’s forecast of Russian or Chinese intentions. Rules of that kind are unglamorous because they concede that the drafters do not know the future. That concession is their strength: they let the people who will live with the consequences adjust as the facts arrive.

A treaty that leaves its own central word in dispute will be interpreted by whoever holds the runway. In a decade, some officer at the far end of the island will consult the text to see who may tell him to stop, and find a ledger with the line left blank.