Denmark has invoked a stark Cold War-era directive, instructing its forces in Greenland to "shoot first and ask questions later" should U.S. troops attempt any move on the strategic Arctic island, as President Donald Trump ramps up rhetoric about seizing control. The order revives a 1952 rule of engagement, allowing soldiers to respond immediately to incursions without higher approval, signaling Copenhagen's resolve to defend its territory amid escalating transatlantic friction.

Trump, in his second term since January 2025, has revived his 2019 push to acquire Greenland, framing it as essential for U.S. national security against Arctic rivals like China and Russia. Danish officials confirmed the policy activation after Trump's envoy hinted at military options, prompting Denmark's Defence Ministry to affirm troops won't hesitate in a potential standoff. This comes as the U.S. already operates radar sites there under NATO agreements, yet Trump demands full ownership of the mineral-rich landmass.

Greenland's ice-covered expanse hides vast rare earth reserves and key positions for missile tracking, drawing superpower interest as climate change opens new shipping lanes. Denmark has intensified military drills in the region since September 2025, while Greenlandic leaders voice frustration over Copenhagen's handling, with some open to U.S. investment talks. Public sentiment in Denmark runs high against yielding, viewing Trump's overtures as imperial overreach.

Prime Minister Mette Frederiksen warned that any U.S. action would "end NATO," fracturing the alliance Trump once championed. European partners, including France, are rallying contingency plans, fearing broader fallout from unilateral moves reminiscent of past U.S. interventions. Analysts note this echoes Trump's Venezuela threats, testing post-inauguration unity. As of January 9, 2026, diplomatic channels remain open, but Denmark's fortified stance underscores a chilling message: Arctic ambitions won't come without a fight.