Poland has triggered Article 4 of the North Atlantic Treaty Organization, NATO, after the country reported 19 “breaches” of its airspace by Russian drones on Wednesday.

NATO fighter jets shot down multiple Russian drones that violated Polish airspace during an attack on neighboring Ukraine, marking the first time that shots were fired by the alliance since the start of the war in Ukraine. A total of 16 drones were found scattered throughout the country, Poland’s interior ministry said later on Wednesday.

Now, NATO allies have formally discussed the situation, which Polish officials have called a “Russian provocation.” This is what you need to know about the invocation of Article 4:

What is NATO Article 4?

The transatlantic defense alliance employs the principle that an attack on on

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