In early 2026, during his second term, U.S. President Donald Trump has reignited his controversial pursuit of acquiring Greenland from Denmark, significantly escalating an already tense diplomatic situation. Trump's administration cites national security concerns, arguing that U.S. control over the strategic Arctic territory is essential to prevent Russia or China from gaining influence there and for the planned 'Golden Dome' air and missile defense system. However, these demands, which have reportedly included suggestions of military force, have been met with unequivocal rejection from both the Greenlandic government and Denmark. Greenland's officials have stated that the island is 'not for sale' and that its people are 'very, very worried' about the U.S. rhetoric, finding the idea of a takeover 'unfathomable'. The crisis has triggered widespread alarm among European allies, leading to a significant strain on NATO and EU ties. Several European leaders, including Denmark's Prime Minister Mette Frederiksen, have issued strong warnings, with some declaring that a U.S. military move on Greenland would signify the 'end of NATO' due to the violation of a member state's sovereignty and the alliance's core principles of cooperation. European countries, including France, Germany, Italy, Poland, Spain, and the United Kingdom, have issued joint statements reaffirming support for Danish sovereignty and the collective security within NATO. Furthermore, the European Union is reportedly preparing potential sanctions against American companies as a retaliatory measure, underscoring the severity of the diplomatic fallout. The unfolding situation has exposed profound divisions and a critical challenge to the transatlantic alliance's unity, raising questions about Europe's ability to respond collectively to such threats and assume greater responsibility for its own security in an increasingly volatile international landscape.