One Chain of Command: Why Five Small Countries Are Quietly Rewriting How Alliances Work

In August, Sweden sent fighter jets and a warship to help Finland patrol its eastern skies and the Gulf of Finland against Russian incursions. The striking part was not the hardware. It was the command structure: Swedish forces operated under Finnish command and followed Finnish rules of engagement. Two countries, one chain of command. For an alliance built on the idea that every member defends its own borders, that is a quiet revolution.

The situation

The five Nordic countries — Denmark, Finland, Iceland, Norway, and Sweden — have spent four years knitting their militaries together. They now share a long-term defense strategy, a cross-border military transit corridor, constant joint exercises, and levels of command integration no one would have predicted in 2020. They are, in effect, building a regional deterrence cluster: a tight group of neighbors who coordinate so closely they can fight as one force.

They are doing this under pressure from two directions at once. Russia's appetite for risk is rising — more sabotage of European infrastructure, more probing of airspace. And the United States is pressing Europe to take primary responsibility for its own defense. The Nordics face a harder adversary with less American help. Their answer is to pool what they have.

The model: minilateralism and the free-rider problem

The established idea here is minilateralism — a term popularized by the writer Moisés Naím around 2009 to describe cooperation among a small number of highly motivated, like-minded states, as opposed to grand multilateral institutions where everyone must agree before anyone can act.

The logic rests on a classic problem first laid out by the economist Mancur Olson in The Logic of Collective Action (1965): large groups are worse at producing shared goods than small ones. When thirty-two NATO members share responsibility for defense, each has an incentive to do a little less and let others carry the load — a free-rider problem. The bigger the group, the weaker each member's sense that its own contribution matters, and the harder it is to notice who is slacking. Olson's counterintuitive conclusion, borne out across decades of alliance research: shrinking the group can increase cooperation.

Minilateral clusters exploit exactly this. Among five neighbors facing the same threat on the same map, free-riding is obvious and costly. Everyone can see who is pulling their weight. Shared geography and a shared adversary convert a vague collective obligation into concrete, enforceable cooperation.

The second idea at work is specialization — David Ricardo's old insight that a group produces more when each member does what it does relatively best rather than everyone doing everything. Instead of each small country maintaining a full, redundant set of capabilities, the Nordics have divided the labor. Finland commands regional land operations. Norway hosts the air operations headquarters. Sweden is the logistics and transit hub. Denmark runs special operations command. The combined force is larger than the sum of its parts.

The mechanism, step by step

The sequence matters, because it shows the two conditions this kind of cooperation actually needs: a shared threat, and the removal of political friction.

It started as cost-cutting, not strategy. In 2009, recession-squeezed budgets pushed the five countries to form Nordic Defense Cooperation (NORDEFCO), mainly to share procurement costs. It had modest wins and stalled — a benign threat environment gave no one a reason to push through the bureaucratic friction. (This is Olson's point in reverse: with nothing urgent at stake, free-riding won.)
A shock supplied the motive. Russia's 2014 annexation of Crimea reframed cooperation from "a way to save money" into "a security necessity." Finland and Sweden, then outside NATO, built a no-limits partnership including joint wartime planning.
A second shock removed the obstacles. When Finland and Sweden joined NATO after Russia's 2022 full-scale invasion, the legal and political barriers between allied and non-allied states vanished. Integration accelerated. By 2023 the four air forces were planning to operate their combined ~250 advanced fighters as a single force.
The cluster nests inside the big alliance rather than competing with it. Larger allies — France, Germany, the UK, the US — still exercise in the Nordic space and fill gaps in intelligence and surveillance. The regional cluster raises the local baseline; NATO provides the backstop.

The core claim: regional clustering and the broad alliance are not rivals. A strong local lattice makes the whole alliance more effective, and it delivers exactly what Washington says it wants — Europeans who can defend Europe.

The other view

The strongest objection is doctrinal, and it is why NATO leadership treats "regionalization" as nearly taboo. NATO is founded on indivisible security: an attack on one is an attack on all, and no member's safety is traded against another's. Critics worry that formal regional clusters erode that principle. If northern Europe handles the north and the Baltics handle the Baltics, the alliance could drift toward a collection of neighborhood watches rather than one guarantee — and an adversary might gamble that a distant member won't risk much for a problem "belonging" to someone else's cluster. That is the free-rider problem reappearing one level up: visible reciprocity within a cluster can weaken the sense of obligation between clusters.

The Nordic answer is that their clustering happens at the military level, under NATO plans, while the political guarantee stays whole. Whether that distinction holds under real pressure is genuinely unknown. It has never been tested in a crisis.

A second uncertainty is the United States itself. The same administration pushing Europe toward self-reliance has handled Greenland and the North Atlantic erratically — undercutting, at moments, the very allies delivering what it asked for. Deterrence clusters assume a stable American backstop. If that assumption weakens, the model's math changes.

Where else this pattern appears

The clustering logic is not military at its root. It is what happens whenever a large group's shared obligation gets diluted, and a motivated subset carves out a smaller circle where contributions are visible and reciprocity is enforceable.

Trade. When global negotiations stall across 160 WTO members, smaller blocs of willing partners cut regional deals that actually move. Same free-rider problem, same minilateral workaround.
Climate. Sprawling UN summits produce lowest-common-denominator pledges; "climate clubs" of a few committed economies can set harder standards among themselves.
Your own work. A twelve-person committee where responsibility is everyone's and therefore no one's is Olson's problem in miniature. The fix is the same: a small working group of three who can see each other's contributions and divide the labor by who is best at what.

The pattern to carry away: when a group gets too big to enforce its own promises, the motivated shrink the circle until promises become visible again.

What to watch

Two signals will show whether the Nordic model spreads or stays a northern exception.

First, the Baltics and Poland. Estonia, Latvia, and Lithuania have historically relied on outside patrons rather than each other. Watch whether they build a NORDEFCO-style layer — coordinated defense plans, merged rocket systems, a shared air-defense stock — and whether Poland, now a serious military power, is folded in. That is the clearest test of whether clustering is a repeatable template or a Nordic accident of unusual trust and geography.

Second, US behavior toward Greenland and the North Atlantic. A reset that embraces the Nordic effort would signal that Washington sees clusters as allies of its goals. Continued friction would signal the opposite.

Expectation: ~60% that at least one formal minilateral defense framework resembling NORDEFCO emerges among the Baltic states (with or without Poland) within three years, given the momentum already visible in joint procurement and the Baltic Defense Line.

Distilled from Foreign Affairs