# Article 5

A Transatlantic Test: Greenland, Tariffs and the Strain on NATO’s Foundations

A US threat linking tariffs and territorial demands over Greenland has ignited a transatlantic dispute that tests NATO’s foundational premise: that allies do not coerce one another with force. European states have protested, sent symbolic military contingents to Greenland and accelerated talks about strategic autonomy, raising the prospect that NATO’s character could shift from mutual defence to a more transactional arrangement.