Poland has invoked Article 4 of the North Atlantic Treaty Organization after shooting down Russian drones that entered its airspace on Wednesday.

The incident came three days after Russia's largest aerial attack on Ukraine since the start of its current invasion in 2022, and represents the first time a NATO member is known to have fired shots since that war began.

The article is not as well known as the treaty's Article 5, which stipulates that an attack on one of the military alliance's 32 member states is considered an attack on all.

But it is increasingly being invoked.

Poland shoots down at least 3 Russian drones in its airspace

Analysis Poland says it found 14 Russian drones on its territory. Just how will NATO respond?

Article 4, the shortest of the NATO treaty's 14 articles,

See Full Page