Why NATO can't handle Trump's Greenland gambit

Donald Trump's push to acquire Greenland has escalated from last year's purchase offer to a threat of military force, raising fears of NATO's biggest member attacking a smaller ally.

Experts warn this undermines Arctic security and exposes NATO's political vulnerability.

Denmark faces pressure not convene emergency consultations under NATO Article 4 as leaders say the crisis could spell the end of the transatlantic alliance if unresolved.