Poland is sounding the alarm. Its leaders want NATO to consider a tough new response: a no-fly zone over Ukraine. The proposal follows a wave of Russian drone incursions into Polish airspace, an event that raised security fears across the alliance.

NATO’s central purpose is to defend its member states from attack, real or perceived, and that’s what NATO did.

Polish fighter jets, with help from NATO allies, shot down multiple Russian drones that entered its eastern border early on Sept. 10. It was the first time the NATO member directly engaged with Russian military assets in its airspace since Moscow's invasion of Ukraine in 2022.

Article 4 allows member states to start a formal discussion within the alliance about threats to their security. It does not commit the alliance to military action.

The U.S.-led military alliance said it would bolster defenses along its eastern flank after the incursion, the first of its kind since the Ukraine war began; Russia denied targeting Poland.

Multiple Russian drones crossed into Poland in what European officials described as a deliberate provocation, causing NATO to send fighter jets to shoot them down.

A continent already on edge over the Ukraine war sees a Russian challenge to NATO readiness and to an America that wants to disengage from Europe.

Military officials in Poland say the country's airspace was "repeatedly violated by drone-type objects" in the overnight hours amid Russian strikes on targets in Ukraine.

NATO is preparing a defensive military response to the drone incursion in Poland to strengthen deterrence across the alliance’s eastern flank, according to a person familiar with the matter.

Just days after an "unprecedented" violation of Polish airspace by Russian drones, the Kremlin indulged in a provocative display right next to NATO's border by deploying Iskander-M ballistic missiles just 40 kilometers from Poland.