Sky News reports.During a meeting with the defense ministers of the E5 group, Healey said that last night “Putin hit a new level of hostility against Europe.”"We saw across NATO's eastern border a serious violation of Polish airspace deep enough for Warsaw Airport to be closed and NATO jets shooting down Russian drones in what is the first defensive action of its kind since Putin launched his full-scale attack on Ukraine," he added.The UK Defense Secretary noted that this was the first such operation since the start of Russia’s full-scale invasion of Ukraine.“We say to President Putin, your aggression only serves to strengthen the unity between our NATO nations. Your aggression only serves to strengthen our determination to stand with Ukraine. And your aggression reminds us that a secure Europe needs a strong Ukraine, and that the security of Europe starts in Ukraine,” Healey said.Polish Armed Forces’ Operational Command put air defense systems and aviation on highest alert due to Russia’s night attack on Ukraine: Russian drones violated the country’s airspace. Search continues for downed drone sites. The Ministry of Internal Affairs has reported finding missile fragments.As a result of a Russian attack on the night of September 10, drone debris fell on a residential building in a village in Poland’s Lublin Voivodeship. No one was injured.On Wednesday, September 10, NATO activated Article 4 of the North Atlantic Treaty after Russian drones violated Polish territory.