Greenland is witnessing its largest-ever military exercise as NATO allies stage Arctic Light 2025, a drill designed to test cold-weather combat capabilities and signal commitment to Arctic security. Led by Denmark, the exercise has drawn forces from several European partners but pointedly excluded the United States, a decision that underscores growing tensions over sovereignty and influence in the region.

NATO’s Biggest Drill in Greenland

More than 550 troops are taking part in the exercise, which runs from September 9 to September 19, 2025. Participating nations include Denmark, France, Germany, Sweden, and Norway. The drills cover a wide range of operations, including:

Deployment of F-16 fighter jets

Naval maneuvers in Arctic waters

Use of helicopters, drones, and special forces

Live-fire exercises and cold-weather training

This scale makes Arctic Light 2025 the most significant military activity ever conducted in Greenland. For Denmark, which is responsible for the island’s defense and foreign affairs, the exercise demonstrates its ability to coordinate multinational forces in one of the world’s most strategically sensitive regions.

Why the U.S. Was Not Included

Although U.S. Secretary of Defense Pete Hegseth was invited to the opening ceremony, no U.S. military units were asked to participate. Denmark’s armed forces confirmed that American troops were deliberately not included in the operational drills.

The decision follows a series of diplomatic strains between Copenhagen and Washington. Among the flashpoints:

President Donald Trump’s remarks on acquiring Greenland, which reignited political debate over U.S. intentions in the Arctic.

Reports of U.S.-linked influence operations in Greenland, where individuals allegedly sought to identify locals willing to back independence or closer alignment with Washington. Denmark summoned the U.S. envoy earlier this month in response.

Ongoing disagreements over sovereignty and the future of Greenland’s resources, as the island gains importance due to melting ice and access to shipping lanes.

While the U.S. maintains a strong presence at Pituffik Space Base in northwest Greenland, the absence of its forces from Arctic Light 2025 is widely viewed as a symbolic move highlighting Danish resolve to defend its territory independently.

Strategic Context in the Arctic

The Arctic is becoming a central theatre of global competition. Russia has modernized its northern military infrastructure and expanded patrols in Arctic waters, while China has declared itself a “near-Arctic state” and invested heavily in shipping, research, and infrastructure projects.

Against this backdrop, Arctic Light 2025 serves three main purposes:

Demonstrating readiness – Training European forces in harsh Arctic conditions to ensure operational effectiveness.

Strengthening alliance cooperation – Showing that NATO members can operate effectively together, even without U.S. military assets on the ground.

Political signalling – Reinforcing Denmark’s sovereignty over Greenland at a moment when external interest in the territory is rising sharply.

Implications for the Alliance

The absence of U.S. units from Greenland’s largest drill carries weighty implications:

European Burden-Sharing: The exercise demonstrates that European NATO members are capable of organizing and leading a large-scale operation without direct U.S. involvement.

Diplomatic Strains: Although cooperation between Washington and Copenhagen continues elsewhere, the decision reflects underlying mistrust and differing approaches to Greenland’s future.

Greenland’s Sovereignty Debate: For both Denmark and Greenland’s leadership, the exercise is a reminder that political control of the island is not up for negotiation, despite repeated external interest.

Conclusion

Arctic Light 2025 is more than just a military drill. It represents a turning point in Arctic geopolitics, with Denmark asserting its leadership and European allies showing solidarity in a sensitive region. The U.S. absence underscores the current diplomatic rift and highlights how Greenland has become a focal point of strategic competition.

As climate change opens new Arctic routes and resources, Greenland will remain at the heart of geopolitical maneuvering. Denmark’s exercise is a clear message: it intends to protect its sovereignty and shape the Arctic’s security landscape—even without the immediate involvement of its most powerful ally.