Poland said early Wednesday that multiple Russian drones entered and were shot down over its territory with help from NATO allies, describing the incident as an “act of aggression” carried out during a wave of Russian strikes on Ukraine.

Polish Prime Minister Donald Tusk said it was the first time Russian drones were shot down on the territory of a NATO member state.

“In all likelihood, we’re facing a large-scale provocation," Tusk told a news conference on Wednesday.

"We’ve had consultations with our NATO partners and I’m in touch with the NATO Secretary General," he added.

"We’re determined to react as adequately as last night if similar incidents repeat in the upcoming hours and days.”

Several European leaders said they believed Russia was intentionally escalating the war, and NATO was discussing the incident in a meeting.

It came three days after Russia's largest aerial attack on Ukraine since the war began, an attack that for the first time hit a key government building in Kyiv.

Polish Defense Minister Władysław Kosiniak-Kamysz wrote on X that more than 10 objects crossed into Polish air space, but he did not specify an exact number.

He thanked NATO Air Command and The Royal Netherlands Air and Space Force for supporting the action with F-35 fighter jets.

Polish airspace has been violated multiple times since Russia's full-scale invasion of Ukraine in 2022, but there has been nothing on this scale either in Poland or in any other Western nation along the eastern flank of NATO and the European Union.