Perspectives: Arctic Endurance Was Not an Exercise
DR's investigation reveals that the multinational operation tracked across Greenland since January was a coordinated European defence contingency against a US seizure — politically prepared with allies since early 2025.
When Danish Defence Command announced Exercise Arctic Endurance in January 2026, the language was measured. A multinational training activity in and around Greenland. A continuation of similar activities conducted in 2025. Participating nations: France, Germany, Sweden, Norway, Finland, the Netherlands, Iceland, Belgium. Analysts, including this publication in our NATO Exercises 2026 guide, catalogued Arctic Endurance alongside Cold Response 26, Steadfast Dart 26, and DEFENDER-Europe 26, and tracked its absorption into NATO's Arctic Sentry framework on 11 February.
A major investigation published today by DR establishes that the exercise framing was cover. Arctic Endurance was an active defence operation against a potential US seizure of Greenland, politically coordinated with France, Germany, and the Nordic states since early 2025.
The investigation draws on 12 sources: Danish government officials, senior military officers, intelligence sources in Denmark, France, and Germany — all active in the crisis. Each disclosure corroborated by at least two, typically more, independent sources. A companion DR analysis frames the implications for NATO cohesion.
Force Posture
When Danish soldiers deployed to Greenland in mid-January, they carried demolition charges to destroy the runways at Nuuk and Kangerlussuaq — the two fields capable of receiving C-17/C-130-class military airlift — and blood products from Danish blood banks. The deployed forces carried KUP ammunition. Danish F-35s dispatched northward were armed live. HDMS Peter Willemoes, an Iver Huitfeldt-class air defence frigate, joined the naval component.
The initial echelon was Jægerkorps special operations personnel. The main force followed from the Jutland Dragoon Regiment (Holstebro), reinforced by soldiers from the Engineer Regiment and French alpine troops from 27e Brigade d'Infanterie de Montagne. The French frigate Bretagne operated alongside the Danish inspection vessel Thetis in the North Atlantic. A French MRTT provided tanker support for Danish F-35 patrol flights along Greenland's east coast, operating from Keflavík. Kangerlussuaq maintained its permanent Challenger 604 ISR presence.
The soldiers deployed under the kongelig forsvarsordre with no de-escalation clause — a departure from standard Danish practice. DR reports having reviewed the operational order dated 13 January 2026: a scalable defence operation with provision for further reinforcement. By 19 January, 200 additional soldiers were on the ground and Army chief General Peter Boysen had arrived personally.
The 2025 Origin
The most consequential element of DR's investigation is the timeline.
According to French and German sources, Denmark began building political support for the contingency in Paris, Berlin, and the Nordic capitals in early 2025, shortly after Trump's election. The objective was a European political alliance committed to the defence of the Rigsfællesskabet.
The military groundwork ran in parallel. Throughout 2025, Danish Defence progressively expanded its Arctic presence — publicly visible, but with undisclosed political purpose. In August, a PASSEX with the French Navy near Qaqortoq; participation in the Canadian-led Operation Nanook Tuugaalik alongside French and German units. In September, Exercise Arctic Light 2025 — ten days of critical infrastructure protection, boarding operations, Arctic drone deployment with allied forces. DR's sources now indicate these also served as rehearsals for the contingency activated in January.
The original plan envisaged phased European deployment throughout 2026. The January crisis compressed the timeline.
The January Accelerant
Eight of DR's twelve sources identify the US military operation in Venezuela on 3 January 2026 as the decisive factor. It demonstrated operational willingness — not merely rhetorical intent — to use military force for political objectives, narrowing the gap between threat and precedent for officials who had been tracking Trump's Greenland rhetoric for months.
The operations order followed on 13 January. Within a week, Denmark had Jægerkorps, Dragoons, and Engineers on the ground in Nuuk and Kangerlussuaq; French 27e BIM alpine troops and French special forces operating in Kangerlussuaq; armed F-35s running patrol sorties from Keflavík with MRTT support; Peter Willemoes and Bretagne at sea; and a Hercules airlift chain running into Nuuk Lufthavn.
Force dispositions: DR Nyheder (19 Mar, 21 Jan, 24 Jan 2026), Danish Defence Command (forsvaret.dk: 20 Jan, 23 Jan, 1 Feb, 9 Mar 2026), French MFA (15 Jan 2026), Swedish Armed Forces (försvarsmakten.se: 18 Feb 2026), German Defence Ministry via Aerotime Hub (16 Jan 2026), UK House of Commons Library (17 Mar 2026). Naval patrol zone and flight routes are schematic approximations based on published activity descriptions, not operational boundaries. Großwald, 19 March 2026.
The Multinational Screen
Six of DR's sources confirm the strategic logic: place as many different national flags on the ground as possible, ensuring any US seizure would require hostile action against the uniformed forces of multiple NATO allies simultaneously.
Denmark, France, Germany, Sweden, Norway, Finland, the Netherlands, Belgium, Iceland, and the United Kingdom all contributed. France alone offered forces equivalent to a small battalion. Sweden deployed planning officers within days of Denmark's request, followed by Blekinge Wing Air Force Rangers — C-SOF and CSAR specialists — operating under Arctic Sentry through February and March. Germany sent a 13-person reconnaissance team. Norway, Finland, the Netherlands, and Belgium provided planning or liaison personnel. The UK sent a single officer at Denmark's request.
The eight-nation statement of 18 January — Denmark, Finland, France, Germany, the Netherlands, Norway, Sweden, the United Kingdom — described Arctic Endurance as a "pre-coordinated Danish exercise" that "poses no threat to anyone." The statement served as diplomatic packaging for an operation already underway with demolition plans, casualty provisions, and armed fast jets.
None of DR's sources had intelligence of concrete American attack plans. The assessment factored Trump's stated intentions, the Venezuela precedent, and what a German senior official described as the absence of institutional restraints that might moderate them. A French official told DR that Europe must relearn the grammar of power and can no longer assume American military backing.
Exercise or Operation: The Honest Question
The framing above — and DR's own headline — implies a clean binary: they told you it was an exercise, it was actually an operation. The evidence is compelling, but the binary deserves scrutiny.
The case for a softer reading is substantial. Modern NATO military practice does not draw a clean line between exercises and operations, and hasn't for some time. Enhanced Forward Presence in the Baltics is a permanent tripwire posture, but nobody frames it as an operation disguised as a presence. Baltic Sentry is classified as an "increased vigilance activity" — a bureaucratic category that deliberately sits between exercise and operation. Almost every significant NATO exercise since Steadfast Defender 24 has carried dual-use characteristics. The lines are blurred by design, not deception.
Denmark could have been doing exactly what it publicly stated — building Arctic operational capability with allies — while simultaneously layering genuine contingency planning on top. That is not cover; that is how a competent military operates in a live threat environment. You exercise precisely the capabilities you would need in a real scenario. The 2025 activities — Arctic Light, Nanook Tuugaalik, the PASSEX with France — could have been simultaneously genuine capability building and rehearsal for a Greenland defence contingency. Those are not contradictory; they are complementary. The kongelig forsvarsordre with no de-escalation clause is operationally significant, but Danish forces deployed to Afghanistan and Mali under comparable orders. KUP ammunition is unusual for a pure exercise, but not unprecedented for a deployment in a live threat environment. And the tripwire logic — multinational flags on the ground to raise the cost of hostile action — is precisely what NATO does in Estonia, Latvia, Lithuania, and Poland. Nobody frames eFP as "not really a presence, actually an operation."
The case for a harder reading rests on specifics that are difficult to reconcile with routine capability building. Blood products and demolition charges are the hinge. DR's own defence sources make the distinction explicitly: you do not pack blood and explosives for an exercise. You pack them when you are preparing for an attack. The operational order DR reviewed describes a defence operation, not an exercise framework — those are structurally different documents with different planning assumptions, different escalation contingencies, different force protection objectives. And the political timeline — Copenhagen seeking allied backing from early 2025, then compressing a year-long phased deployment into days after the Venezuela operation — describes operational planning, not exercise design. Exercises have training objectives and evaluation criteria. What DR describes has deterrence objectives and escalation scenarios.
The source incentive problem also warrants acknowledgement. All 12 sources are anonymous. All are active in the crisis. All have an institutional interest in the narrative that Denmark and its allies were decisive, prepared, and coordinated from the start. Post-hoc rationalisation is a real risk. "We had a plan since 2025 and were ready" is a considerably more flattering account — for Copenhagen, for Paris, for Berlin — than "we scrambled in January and improvised under pressure." The French official offering a small battalion sounds decisive, but France providing forces for a NATO ally exercise is standard procedure. The framing DR's sources apply to their own actions may carry more drama than the operational reality warranted at the time.
Where the honest analytical position lands, in our assessment, is that the exercise/operation distinction is itself the story. What DR reveals is not a deception but an emerging model: European militaries building genuine operational content inside exercise frameworks, embedding deterrence posture in training activities, deliberately blurring the line for strategic and diplomatic effect. Arctic Endurance was labelled an exercise because that classification provides diplomatic cover, avoids escalation, and keeps activities within standard NATO frameworks. The operational substance underneath — the contingency planning, the demolition charges, the armed F-35s, the forsvarsordre — was real. Both things are true simultaneously.
That is a more structurally significant finding than a straightforward deception narrative. It suggests the exercise-as-operation is becoming the model for European autonomous defence activity — not a one-off exception driven by the Greenland crisis.
Institutional Trajectory
The Danish-led European contingency was folded into NATO's Arctic Sentry on 11 February — an open-ended operational posture led by JFC Norfolk, born from the Rutte-Trump framework agreed at Davos, coordinating with NORAD, USNORTHCOM, and USEUCOM. An operation built to deter American action in Greenland now operates within a command structure that includes American participation.
The forsvaret.dk language — "a continuation of similar activities conducted in 2025" — was the public-facing description of a political and military process underway for a year before anyone outside a small circle of European officials understood what it was.
What This Leaves Open
The contingency architecture built for Greenland — multinational rapid deployment, distributed tripwire forces, pre-positioned denial capabilities, scalable operational orders — is transferable. A senior Danish security source warned DR that the crisis is not resolved: Trump has three years remaining, and the challenge to the Rigsfællesskabet persists. Danish and European military activities in Greenland continue under the NATO umbrella.
The architecture built for Greenland now sits inside Arctic Sentry — a NATO framework under JFC Norfolk, coordinating with USNORTHCOM. Europe built its first autonomous defence contingency against Washington, then folded it into a command structure that includes Washington.
Sources: DR Nyheder (Niels Fastrup, Lisbeth Quass, Mads Korsager Nielsen, Rikke Gjøl Mansø), 19 March 2026; Danish Defence Command; Danish Ministry of Defence; NATO Allied Command Operations; French Ministry for Europe and Foreign Affairs; Swedish Armed Forces; UK House of Commons Library. Großwald NATO Exercises 2026 guide.