Arctic 2026: The Greenland Deal, NATO's Arctic Sentry and Russia's Northern Fleet Build-Up

WHAT CHANGED SINCE APRIL

The April edition of this briefing described the Arctic as a region drifting towards gradual militarization. Since then the pace has accelerated, and the biggest shock came from inside NATO rather than from Russia. In January 2026 President Donald Trump escalated his demand that the United States take control of Greenland, threatened tariffs on eight European allies and refused to rule out force. European troops deployed to the island as a tripwire. The dispute simmered for eight months until the United States, Denmark and Greenland reached a security agreement on 18 September that expands the US military footprint without transferring sovereignty.

At the same time, the alliance's Arctic posture has been rebuilt. NATO launched Arctic Sentry on 11 February to bring national activities in the High North under one operational command. Russia answered with a large nuclear-forces exercise in May, new submarine launches and sharper rhetoric: on 1 September Foreign Minister Sergei Lavrov said NATO wants to turn the Arctic into "a new front". The next day Norway seized a Russian ship at Svalbard. Meanwhile the Northern Sea Route is on course for a record year, driven by Chinese shipping.

TIMELINE: JANUARY TO SEPTEMBER 2026

• 3–8 January: After the US operation in Venezuela, White House officials say the United States has a right to Greenland. Trump says he must possess the whole island rather than rely on the 1951 defence agreement, and the White House says military force is "always an option". European leaders issue a joint statement defending Greenland's sovereignty.
• 17 January: Trump announces 10% tariffs from 1 February on Denmark, Norway, Sweden, Finland, France, Germany, the Netherlands and the UK, rising to 25% by 1 June unless Denmark cedes Greenland. The largest protest in Greenland's history takes place in Nuuk.
• 19–20 January: Denmark sends Arctic combat forces to Greenland. European allies launch Operation Arctic Endurance, deploying small national contingents as a tripwire.
• 21 January: At Davos, Trump and NATO Secretary General Mark Rutte announce the "framework of a future deal" on Arctic security. The tariff threat is withdrawn. Technical talks between the US, Denmark and Greenland begin on 28 January.
• 11 February: NATO launches Arctic Sentry, led by Joint Force Command Norfolk. Sweden commits Gripen fighters to patrols around Iceland and Greenland.
• 9–19 March: NATO's Cold Response 2026 exercise brings about 25,000 troops from 14 nations to Norway and Finland.
• 13 March: Canadian Prime Minister Mark Carney announces $35 billion for defence and infrastructure in Canada's North.
• 19–21 May: Russia holds a nuclear-forces exercise involving the Northern Fleet, with more than 64,000 personnel. Large areas of the Barents Sea are closed; the submarine Bryansk fires a Sineva ballistic missile from Arctic waters.
• June: The Yasen-M submarine Arkhangelsk fires an Oniks cruise missile from under water in the Barents Sea at a target more than 200 km away.
• 6–8 July: Canada names Germany's TKMS preferred supplier for its new submarine fleet. At the NATO summit in Ankara, Trump repeats that Greenland "should be controlled by the United States".
• 28 July: Russia launches the Yasen-M submarine Ulyanovsk, due to join the Northern Fleet by the end of the year.
• 1 September: Lavrov says NATO's growing Arctic activity poses "direct threats" to Russia.
• 2 September: On a Norwegian court order, the Governor of Svalbard seizes the Russian passenger ship Professor Molchanov at Barentsburg on behalf of Ukraine's Naftogaz.
• 18 September: The United States, Denmark and Greenland announce a security agreement expanding US basing rights and barring Russian and Chinese military presence.

THE GREENLAND CRISIS AND THE 18 SEPTEMBER DEAL

Greenland matters to Washington for three reasons: it sits on the shortest flight path for missiles between Russia and North America, it anchors the GIUK gap (Greenland–Iceland–UK) that Russian submarines must pass to reach the Atlantic, and it holds significant deposits of rare earths and other critical minerals. The US already operates Pituffik Space Base in the far north under a 1951 defence agreement, and during the Cold War it ran seventeen bases on the island.

The January crisis was the most serious rift inside NATO in decades. European allies took the extraordinary step of deploying forces partly as a signal to another ally. The Davos framework defused the tariff threat but not the underlying demand, and Trump raised it again in April and at the July summit.

The agreement announced on 18 September updates the 1951 arrangement rather than replacing Danish rule. According to US officials and reporting by The Christian Science Monitor and ABC News, it:

• gives the United States permanent access, basing and overflight rights, with two new bases planned in addition to Pituffik;
• includes cooperation on Trump's Golden Dome missile-defence programme;
• bars Russia and China from basing troops in Greenland and sets up mechanisms to block investment from non-allied states in sensitive sectors, including minerals;
• has no expiry date and, according to US officials, would remain in force even if Greenland became independent;
• explicitly recognises the sovereignty and territorial integrity of the Kingdom of Denmark.

Danish Prime Minister Mette Frederiksen presented the deal as protecting Danish sovereignty; in Copenhagen the main reaction was relief that the crisis appears to be over. The text was expected to be formally signed on the sidelines of the UN General Assembly. Open questions remain: where the new bases will be, how much say Nuuk will have over their use, and whether Trump will treat the deal as final.

NATO'S RESPONSE: ARCTIC SENTRY

Arctic Sentry is NATO's first operation dedicated to the High North. It does not create a new standing force. Instead it gives NATO planners a single picture of what allies are already doing in the region — air patrols, naval deployments, exercises and surveillance — and coordinates them under Joint Force Command Norfolk in Virginia. The model follows Baltic Sentry, launched in 2025 after damage to undersea cables in the Baltic Sea.

National contributions so far include Swedish Gripen fighters around Iceland and Greenland, four German Eurofighters, planned Norwegian and Danish drills, and a British commitment to double its troop presence in Norway to about 2,000 over three years. The accession of Finland and Sweden is what makes the approach possible: NATO now controls almost the entire Nordic land mass facing Russia's Kola Peninsula, and exercises such as Cold Response can move forces across Norway, Sweden and Finland as one theatre.

Anti-submarine warfare is the priority. In May nine allies trained in the Norwegian Sea in the Dynamic Mongoose exercise, and Norway is testing uncrewed sensors in Arctic conditions. A "Task Force X-Arctic" is testing maritime drones and data-sharing, with a full demonstration planned for 2027.

RUSSIA'S ARCTIC POSTURE

Russia still has the largest military presence and the most extensive infrastructure in the Arctic. The region accounts for at least 10% of Russian GDP, and the Northern Fleet on the Kola Peninsula carries most of Russia's sea-based nuclear deterrent. The war in Ukraine has drawn many of Russia's Arctic ground troops to the front, but naval and nuclear forces in the north have largely been protected.

The May nuclear exercise showed how central the Arctic remains to Russian strategy. The fleet is also being modernised: five Yasen-class submarines are in service across the Northern and Pacific fleets, more are planned, and the Ulyanovsk launched in July will add another. Moscow now presents NATO's Arctic activity as a direct threat, which it can use to justify further investment and pressure on Norway.

Svalbard: the new flashpoint

Svalbard is Norwegian territory, but under the 1920 treaty citizens of signatory states, including Russia, can live and work there. The Russian mining settlement of Barentsburg has about 300 residents. In June 2025 a passenger service from Murmansk restored a direct link to mainland Russia for the first time in 27 years. On 2 September 2026 the Governor of Svalbard seized that ship, the Professor Molchanov, after a Norwegian court allowed Ukraine's Naftogaz to use it to enforce a $4.22 billion arbitration award over assets Russia seized in Crimea. Moscow says the seizure violates the treaty; Oslo has promised to help the stranded crew and passengers. The dispute is legal for now, but it touches the most sensitive point in Russian–Norwegian relations.

THE NORTHERN SEA ROUTE AND CHINA

The Northern Sea Route along Russia's Arctic coast is having its busiest season yet. Rosatom expects cargo traffic to rise about 14% in 2026, and total volumes are expected to exceed 40 million tonnes. The growth comes mainly from China: at least six Chinese companies plan more than 50 voyages this season, and container voyages have climbed from 7 in 2023 and 14 in 2024 to 24 in 2025, with more than 30 expected in 2026. For the first time a Chinese carrier is running a scheduled weekly container service to Europe during the navigation season. By 11 August, tankers carrying about 6 million barrels of Russian crude were already heading to Asia via the route — nearly half of the whole 2025 total.

For Moscow the route is both revenue and leverage, especially while sanctions and Red Sea and Hormuz disruption make southern routes riskier. For NATO, the growing Russia–China partnership in the Arctic is the main reason the region is rising up the agenda. The route is still limited by ice, insurance costs and Russia's control over transit, so it remains a seasonal complement to Suez rather than a replacement.

THE UNITED STATES AND CANADA

Washington's clearest Arctic weakness is icebreakers. Under the ICE Pact with Canada and Finland, contracts have been awarded to Rauma Marine Constructions in Finland and Bollinger Shipyards in the United States to build up to six Arctic Security Cutters for the US Coast Guard. The two built in Finland are due around 2028, and the programme is reported to cost about $6.1 billion. Russia, by comparison, operates the world's only fleet of nuclear-powered icebreakers.

Canada has made its largest Arctic defence commitments in decades. In March Prime Minister Mark Carney announced $35 billion for defence and infrastructure in the North, including new operational support hubs for the armed forces. In July Ottawa named TKMS preferred supplier for its new submarine fleet, the largest procurement in Canadian history, and it is building an over-the-horizon radar with Australia, with initial capability planned by December 2029.

DIPLOMATIC SITUATION

The Arctic Council, chaired by the Kingdom of Denmark for 2025–2027, continues to work on science and environmental issues, but cooperation with Russia remains limited since 2022 and hard security is outside its remit. Real decisions are now made in NATO, in bilateral deals such as the Greenland agreement, and in groupings like the ICE Pact. Territorial questions — continental shelf claims in the central Arctic Ocean, including the Lomonosov Ridge — are still handled under UNCLOS and have not been a source of armed tension.

Russia and China, meanwhile, cooperate more closely in shipping, energy and coast-guard patrols. Neither has an Arctic military alliance, but their growing coordination is what NATO planners now treat as the long-term challenge.

OUTLOOK: WHAT TO WATCH

• The Greenland agreement: the signing text, the location of the two new US bases, and how Nuuk and Copenhagen share decisions on their use.
• Svalbard: whether Russia retaliates against Norway over the Professor Molchanov seizure, and whether Barentsburg's supply problems grow over the winter.
• Northern Fleet: the commissioning of the Ulyanovsk, further missile tests in the Barents Sea, and any signs of Russian Arctic forces returning from Ukraine.
• Arctic Sentry: whether it gains dedicated assets or remains a coordination layer.
• Northern Sea Route: final 2026 cargo figures, and whether Chinese liner services return next season.

The most likely path is continued militarization without direct conflict. The main risks are a close encounter between Russian and NATO forces in the Barents Sea, a Svalbard dispute that escalates beyond the courts, or a new rift inside NATO if the Greenland deal unravels.

FREQUENTLY ASKED QUESTIONS

Why is the Arctic becoming militarized in 2026?

Three trends are coming together. Russia keeps most of its sea-based nuclear deterrent in the Arctic and is modernising its Northern Fleet. NATO has expanded to include Finland and Sweden and launched Arctic Sentry in February 2026. And melting ice is opening shipping routes and resources, drawing in China. The Greenland crisis added a fourth factor: US pressure for a bigger military role in the region.

What did the US, Denmark and Greenland agree on 18 September 2026?

The agreement updates the 1951 defence pact. It gives the United States permanent basing, access and overflight rights in Greenland, with two new bases planned, and includes cooperation on the Golden Dome missile-defence programme. Russia and China are barred from military presence and sensitive investment. It does not transfer sovereignty: Denmark and Greenland say the island remains part of the Kingdom of Denmark.

What is NATO's Arctic Sentry?

Arctic Sentry is a NATO military activity launched on 11 February 2026 and led by Joint Force Command Norfolk. It brings allies' national patrols, deployments and exercises in the High North under one operational picture. Contributions include Swedish Gripens around Iceland and Greenland, German Eurofighters and a larger British presence in Norway.

Why did Norway seize a Russian ship at Svalbard?

On 2 September 2026 the Governor of Svalbard seized the Russian ship Professor Molchanov at Barentsburg on a Norwegian court order. Ukraine's Naftogaz is using it to enforce a $4.22 billion arbitration award against Russia over assets seized in Crimea. Moscow says the seizure breaches the 1920 Svalbard Treaty.

How busy is the Northern Sea Route in 2026?

Cargo on the Northern Sea Route is expected to exceed 40 million tonnes in 2026, about 14% more than in 2025 according to Rosatom. Chinese companies plan more than 50 voyages, including the first scheduled weekly container service to Europe. The route is still seasonal and complements rather than replaces Suez.

Could there be a war between Russia and NATO in the Arctic?

A deliberate war remains unlikely: both sides use the Arctic mainly for deterrence and nuclear forces. The greater risk is an accident or miscalculation, such as a close encounter in the Barents Sea during an exercise, or a legal dispute over Svalbard escalating into a political crisis between Russia and Norway.

Which countries are strengthening their Arctic forces?

Russia is modernising its Northern Fleet with new Yasen-M submarines. The United States is expanding in Greenland and building six icebreakers with Finland and Canada. Canada is investing in northern bases, new submarines and over-the-horizon radar. Norway, Denmark, Sweden, Finland, the UK and Germany are contributing to NATO's Arctic Sentry.

AUTHOR

SOURCES AND REFERENCES

• NATO SHAPE — Arctic Sentry
• The Christian Science Monitor — What did the US and Denmark agree on Greenland?
• CNBC — How Trump's push for Greenland reached crisis point
• Governor of Svalbard — Russian ship seized in Svalbard
• The Barents Observer — Northern Fleet takes part in major nuclear exercise
• The Defense Post — Russia calls growing NATO presence in Arctic a "direct threat"
• Eye on the Arctic — Northern Sea Route cargo to rise 14%
• FDD — Russia is expanding its Arctic submarine fleet
• US Department of Homeland Security — ICE Pact
• Prime Minister of Canada — Canadian Patrol Submarine Project