US President Donald Trump has doubled down on his controversial claim that America "needs Greenland" for national security, tying it to strategic defence plans like the proposed Golden Dome missile shield and concerns about rival powers such as Russia and China in the Arctic. Trump said US control of Greenland is "vital" and beyond negotiation, asserting that NATO would be "far more effective" with Greenland under US authority. However, Greenland and Denmark have firmly rejected any proposal to cede control, emphasising sovereignty and self-determination. Both leaders insist Greenland is "not for sale" and reject Trump's rhetoric, deepening diplomatic strains with close allies.