NATO allies held Article 4 consultations after Russian drone incursion. Here's what that means

The consultations at NATO headquarters were part of a regular meeting of ambassadors from the alliance's 32 member states known as the North Atlantic Council, but Polish Prime Minister Donald Tusk told Parliament that they came under Article 4 of the treaty that founded NATO in 1949 in the aftermath of World War II. Article 4, the shortest of the NATO treaty’s 14 articles, states that: “The Parties will consult together whenever, in the opinion of any of them, the territorial integrity, political independence or security of any of the Parties is threatened.”