The Trump administration's recent threats to seize control of Greenland, a semi-autonomous territory of Denmark, have raised concerns about potential conflict between NATO members. This situation highlights a history of tensions within the alliance, though direct military conflict has been avoided.

While the current situation is unprecedented, historical incidents illustrate the potential for conflict between NATO allies. One such instance, the "Cod Wars" between the United Kingdom and Iceland, involved naval confrontations. According to an Associated Press photo, the Royal Navy frigate HMS Brighton once crisscrossed in front of the Icelandic gunboat Thor, after Thor cut the trawling wires of a British trawler. Both the UK and Iceland were NATO members at the time.

NATO, founded on the principle of collective defense, has Article 5 as its cornerstone. This article states that an attack on one member is considered an attack on all. However, analysts suggest that a U.S. attempt to seize Greenland would test the limits of Article 5 and potentially threaten the alliance's survival. European and Canadian leaders have voiced support for Denmark and Greenland, indicating a potential rift within NATO should the U.S. pursue its threats.

Greenland already hosts the Pituffik Space Base, operated by the U.S. in coordination with Danish authorities. This existing cooperation underscores the complex relationship between the two nations. The U.S. rationale for acquiring Greenland centers on deterring adversaries in the Arctic region. However, the potential ramifications of such a move extend beyond military strategy.

The situation is ongoing, with European and Canadian leaders reportedly developing a plan in response to potential U.S. action. The future of Greenland and its relationship with both Denmark and the United States remains uncertain, as does the potential impact on NATO's unity.