Tensions flare between the United States and Denmark after Donald Trump appoints a special envoy to Greenland and renews calls for U.S. control over the strategic Arctic island. Danish and Greenlandic leaders strongly reject any annexation rhetoric, warning Washington against crossing sovereignty red lines. As Arctic geopolitics heat up amid rising Russian and Chinese activity, Trump’s Greenland push revives global debate over territorial integrity, international law, and great-power competition in the polar region.