French President Emmanuel Macron openly challenged U.S. President Donald Trump following renewed tensions over NATO, Greenland, and looming trade tariffs. After signals of a possible NATO exit debate in France, Macron drew a firm red line against Washington, condemning Trump’s threat to impose sweeping tariffs on European allies as unacceptable. Macron warned that Europe would respond in a united and coordinated manner if the measures are confirmed, while backing Denmark-led military exercises in Greenland. The standoff has exposed deepening fractures within NATO, as Trump’s Greenland push and trade war rhetoric fuel questions over alliance unity and Europe’s strategic autonomy.