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NATO’s 32 ambassadors meet most weeks in a format known as the North Atlantic Council at the military alliance’s headquarters in Brussels. Estonia requested consultations under Article 4 of founding treaty.

After the meeting, that it would use all means to defend against any further breaches of its airspace.

Poland also requested Article 4 talks after the drone incident, and two days later, NATO launched an operation, dubbed with European aircraft and other defenses along its eastern flank.

But as Tuesday's meeting shows, Article 4 talks do not mean automatic military or political consequences.

Article 4 puts urgent matters on NATO’s agenda

Article 4 is the shortest of the Washington Treaty’s 14 articles. It 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.�

NATO operates on consensus, and the talks can lead to some form of joint decision or action. The fact of invoking Article 4 encourages allies to react as one to a situation of importance brought to their attention by a fellow member.

The talks do not automatically lead to any action, unlike of the treaty, which states that NATO’s collective security guarantee, under which allies pledge that an attack on one member of the alliance constitutes an attack on them all.

Bob Deen, an analyst at the Clingendael think tank in The Hague, said Article 4 is “designed to promote better coordination and understanding within the alliance on external threats. It gives all allies the opportunity to urgently put certain threats or developments on the agenda of the North Atlantic Council.�

Second time Article 4 is invoked in 2 weeks

It was only the ninth time that Article 4 has been used since the alliance's formation in 1949, but the second time now in just two weeks and given current tensions on NATO’s eastern flank, it could happen again soon.

Before the drone incident, Poland was one of eight countries – along with Bulgaria, the Czech Republic, Estonia, Latvia, Lithuania, Romania and Slovakia – to seek them after Russia launched its of Ukraine in February 2022.

Poland first invoked Article 4 on March 3, 2014, “following increasing tensions in neighboring Ukraine, as a result of Russia’s aggressive actions,� according to the NATO website. Russia annexed Ukraine's Crimean Peninsula in 2014.

“Article 4 gets invoked relatively rarely but increasingly in recent years; Turkey alone invoked it five times between 2003-2020 in the context of Syria and Iraq,� Deen told The Associated Press.

Not necessarily a step toward Article 5

Deen said that Article 4 is related to Article 5, but is “not necessarily a ‘stepping stone.’�

“Article 5 has only been invoked once, in response to the 9/11 attacks on the United States, immediately bypassing Article 4. In other words: Article 4 can be invoked without triggering Article 5, and vice versa,� he said.

Article 5 underpins NATO’s credibility. It’s a political commitment — not a legal requirement — for all member countries to come to the aid of another member whose sovereignty or territory might be under attack, in whatever way they might deem to be fit.