NATO Faces Unprecedented Crisis as US Threatens Denmark Over Greenland

• NATO's core principle, 'an attack on one is an attack on all,' is being tested by the US's active exploration of acquiring Greenland from Denmark.
• Donald Trump's administration has stated 'all options are on the table,' including military ones, to acquire Greenland, a NATO member's territory.
• Denmark's Prime Minister Mette Frederiksen warned that a US attack on a NATO country would effectively end the alliance.
• European leaders are reluctant to openly criticize Washington due to their reliance on US military support for Ukraine and against Russia.
• Europe, having outsourced its security to the US for decades, is not in a position to challenge Washington forcefully, despite calls for strategic autonomy.

Why It Matters: US threats against Denmark over Greenland expose NATO's internal fragility and Europe's security dependence.