European Commission President Ursula von der Leyen said shooting down aircraft intruding into NATO airspace is "always an option" amid escalating tensions with Russia.
Estonia has requested consultations with NATO under Article 4 of the alliance's charter, following an alleged incursion into its airspace by three Russian MiG-31 fighter jets.
President Zelensky announced that Patriot and HIMARS missiles will be included in the first two aid packages for Ukraine through NATO's PURL mechanism.
UAVs violating Polish airspace and subsequently shot down by NATO have left many Polish citizens uneasy, fearing the conflict could reach their doorstep.
The UK summoned Russia's ambassador to condemn last week's drone incursion into NATO territory, while Moscow said the alliance is "practically directly participating in the war".
Russia appeared to flex its military muscle and demonstrate its commitment to Belarus by test-firing a Zircon hypersonic missile during joint exercises near Poland.