NATO’s Arctic Front Line: Cold Response 2026 Brings 32,500 Troops to Norway, Finland and Sweden

NARVIK, Norway — In the ice-fringed harbor here above the Arctic Circle, American Marines watched armored vehicles rumble off a cargo ship and onto a snow-dusted quay as Norwegian soldiers directed traffic in fluorescent vests. Farther inland, columns of foreign troops threaded along narrow roads built for fishing villages, not tanks, while low-flying jets carved white arcs across a pale March sky.

For 10 days this month, northern Norway and its Finnish and Swedish neighbors have become the stage for one of the largest Arctic war games in modern European history — and a visible reminder that the Nordic region has moved from the margins of NATO strategy to its northern front line with Russia.

The drill, known as Cold Response 2026, brings together roughly 32,500 military personnel from 14 countries and NATO command elements from March 9 to 19. The exercise is led by Norway but spans northern Norway, Finland and Sweden, with training on land, at sea and in the air above the Arctic Circle.

Norwegian officials describe it as a recurring, defensive winter exercise. But the context around this year’s edition — Finland and Sweden’s recent accession to NATO, a new alliance framework for the Arctic and a yearlong push to mobilize Norwegian society for crisis and war — has given Cold Response 2026 a significance that goes well beyond the snow-covered training grounds.

“Cold Response 2026 is one of our most important exercises this year,” the Norwegian Armed Forces said in a public briefing. “We are training under harsh Arctic conditions and demonstrating Norway’s and the alliance’s ability to receive and support allied reinforcements in crisis and war.”

A bigger drill in a changing neighborhood

According to Norway’s military, the exercise gathers about 25,000 troops on Norwegian territory and another 7,500 in Finland, with additional forces operating in northern Sweden. A large computer-assisted simulation runs in parallel, representing notional forces “significantly larger” than those deployed in the field.

Participants include Norway, Finland, Sweden, the United States, United Kingdom, Germany, France, Italy, Canada, Spain, the Netherlands, Denmark, Belgium and Türkiye, as well as NATO headquarters staff. Forces range from U.S. Marines practicing Arctic warfare and trans-Atlantic reinforcement to British commandos operating from Camp Viking, a permanent British hub established in 2023 in Øverbygd, northern Norway.

At sea, allied frigates and support vessels are conducting amphibious landings along the Norwegian coast and in fjords. In the air, fighter jets, maritime patrol aircraft, helicopters and transport planes are rehearsing air defense, anti-submarine warfare and close air support in contested high-latitude airspace. On the ground, mechanized and light infantry, special operations units and logistics troops are learning to move and sustain themselves in deep snow and sub-zero temperatures.

The scenario itself is fictional, built around high-intensity combat in the High North. Norwegian authorities say it is designed to be consistent with NATO’s Concept for Deterrence and Defence of the Euro-Atlantic Area, the alliance’s blueprint for responding to a major crisis or attack.

In a formal notification to the Organization for Security and Co-operation in Europe under the Vienna Document arms control regime, Norway said the aim is to “preserve and further develop tactical military skills and affiliated joint functions within the framework of Defence Plan Arctic Guard and the priorities of the Norwegian Chief of Defence.” The government emphasized that the drill is defensive and that it is Norway’s only major national exercise with allied participation in 2026.

From neutral buffer to integrated front line

The same terrain hosted large NATO-related drills in years past. What is different now is the political map.

Finland joined NATO in April 2023, doubling the alliance’s land border with Russia, and Sweden followed in March 2024 after decades of military nonalignment. In 2024, the long-running Norwegian Cold Response series temporarily ran under the name Nordic Response and was co-hosted by Norway, Sweden and Finland as part of a larger NATO umbrella exercise.

With Cold Response 2026, the Nordic region is for the first time hosting such a large Arctic drill with Finland and Sweden as full members of the alliance and as part of a single operational theater.

“NATO’s northern flank now runs uninterrupted from the Barents Sea to the Baltic,” said one Norwegian defense analyst in Oslo. “These exercises are about learning to defend that space as one, not as separate national pockets.”

The war game is also nested in a new NATO architecture for the Arctic. In February, the alliance launched “Arctic Sentry,” a framework meant to coordinate all NATO-linked military activity in the High North under one concept, while stopping short of creating permanent new bases. Cold Response 2026 is Norway’s main contribution to that effort.

Alliance officials say Arctic Sentry is intended to identify gaps in cold-weather capabilities, improve coordination among allies and manage risks in a region where retreating sea ice is opening new shipping lanes and where Russia and China are increasing their presence.

A year of “total defense”

For Norway, the exercise is not just about military tactics. It is also a centerpiece of what the government has declared “Total Defence Year 2026,” a nationwide test of the country’s ability to withstand security crises and armed conflict by mobilizing not just the armed forces but civilian society.

In Norwegian doctrine, “total defense” refers to mutual support between the military and civilian sectors — from health services and transportation to telecommunications and local government — in wartime and severe crises.

“The objective is to strengthen Norway’s ability to prevent and handle security-political crises and war,” the Armed Forces said in an overview of the initiative. Officials at the Directorate for Civil Protection, the main civilian preparedness agency, have stressed that total defense actors are being exercised under Cold Response 2026 to that end.

During the drill, the government is staging what it calls its most complex health preparedness exercise for war in recent decades. In the Ofoten region around Narvik and in Tromsø, civilian and military medical staff are rehearsing mass casualty scenarios, medical evacuation and hospital surge capacity, simulating the strain that a major armed conflict could place on Norway’s health system.

Justice and preparedness officials have meanwhile been touring northern municipalities, explaining evacuation plans and crisis roles. “People in the Narvik area will see in practice what total defense is, when civilian and military actors work side by side,” the justice and public security minister said in an interview with the national press.

The Defense Ministry has also begun sending out so-called prepared requisition notices to selected owners of vehicles, machinery, boats and properties, informing them in advance that their assets could be taken over in a crisis under updated requisition rules. And, echoing moves in other Nordic countries since Russia’s full-scale invasion of Ukraine in 2022, authorities have urged households to stockpile food, water, medicines and other essentials sufficient for several days without outside help.

Daily life in a staging ground

In the north, the buildup has had tangible effects.

Local media have reported heavy military traffic on key roads, low-flying aircraft over rural communities and increased noise and light from night-time training. Municipal officials in Narvik, inner Troms and northern Nordland have warned of temporary disruptions but have generally urged residents to show patience.

The Armed Forces have published maps of restricted airspace, convoy routes and safety zones and have distributed information leaflets to landowners and residents. “We appreciate the understanding and support shown by the local population,” the military said in guidance to communities, adding that such support is “crucial” to Norway’s role as a host nation for allied reinforcements.

The scale of the activity has also sharpened questions about whether civilian preparedness is keeping pace. Some municipalities hosting critical infrastructure have voiced concern that they are not adequately integrated into national emergency plans. National debates over shelter capacity, evacuation arrangements and civil defense infrastructure have resurfaced as lawmakers consider higher defense spending and broader security budgets for 2026.

Moscow’s shadow and dueling narratives

The exercise unfolds against a backdrop of badly strained relations between Norway and Russia.

Diplomatic ties have deteriorated since 2022 amid mutual expulsions of diplomats, espionage cases and disputes over sanctions and access to the Svalbard archipelago. Norway has tightened controls on Russian activities in the High North, while Moscow has reduced consular staff and criticized what it calls “anti-Russian” steps by Oslo.

Russian military activity in the region has also increased. Norway’s defense establishment says the Russian Northern Fleet has conducted more artillery and naval drills closer to Norwegian waters in the Barents Sea, although Norwegian officials have described those activities as expected and within international law.

Russian state-aligned media have cast Cold Response 2026 as part of a broader Western effort to encircle Russia and threaten its Arctic interests. Some outlets have claimed that NATO aircraft and ships are gathering “at Russia’s borders” and that 25,000 troops are preparing to “block the Northern Sea Route,” the shipping lane along Russia’s northern coast. Those assertions are not supported by Norwegian or NATO planning documents, which do not mention any role for the Northern Sea Route.

However, analysts note that some of the capabilities being drilled — sea control and anti-submarine warfare in the Norwegian and Barents seas, amphibious operations along Norway’s coast — would be directly relevant in any conflict involving Russian forces based on the Kola Peninsula, where much of Russia’s nuclear-armed submarine fleet is based.

Norway’s domestic security service, known as PST, has warned that Russian intelligence is showing “significant interest” in this year’s exercise. In an interview with the newspaper VG, the service said it had been alerted to attempts to map Norwegian military personnel and installations ahead of the drill and that some incidents may never be fully clarified.

Transparency and a thinner rulebook

Norway has made a point of highlighting its transparency around Cold Response 2026. In its notification to the OSCE, Oslo said the drill was being conducted “in accordance with the relevant provisions and spirit of the Vienna Document 2011,” a confidence-building measure that requires observation and prior notification of large military exercises.

The country has published extensive public documentation on the exercise, from restricted airspace coordinates to information for local landowners. Western arms control experts often contrast such moves with Russia’s frequent use of unannounced “snap exercises” that fall below or around notification thresholds and its suspension of other treaty commitments in recent years.

Even so, the overall European security architecture that the Vienna Document was meant to reinforce has frayed since Russia’s actions in Ukraine and the demise of older arms control regimes. Exercises like Cold Response 2026 now take place in a landscape where mutual suspicion is high and formal guardrails are fewer.

As the last convoys roll out and foreign ships weigh anchor later this month, much of northern Norway will return to its usual rhythms of fishing, mining and tourism. But for many residents, the sight of tens of thousands of foreign troops in their valleys, the sound of jets overhead and the arrival of requisition letters and civil defense pamphlets have left an impression.

“We train for something we hope will never happen,” a Norwegian officer overseeing logistics at the port of Narvik said in a recent briefing. In the High North, that hope now coexists with a more visible kind of preparation — one that suggests this once-quiet corner of Europe will remain central to NATO planning, and to its standoff with Moscow, for years to come.