Poland invoked Article 4 of the NATO treaty. What does that mean?

Article 4 of the North Atlantic Treaty Organization is not as well known as its Article 5 collective security guarantee — which says an attack on all is an attack on one — but it is being increasingly invoked,

Poland Calls To Activate NATO Article 4: What Does It Mean?

The Polish prime minister said there had been a serious violation of his country's airspace by Russian drones.

‘Russian incursion is intentional’: EU, NATO condemn attack on Poland; Zelenskyy warns of escalation

Poland shot down Russian drones that violated its airspace during a massive strike on Ukraine, prompting NATO consultations, and coordinated defence operations.
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