By Mitchell McCluskey and Lauren Kent, CNN

(CNN) — NATO has launched an initiative to reinforce the defense of Europe’s eastern flank after a Russian drone incursion into Polish airspace this week, NATO Secretary General Mark Rutte announced on Friday.

The “Eastern Sentry” operation will commence in the coming days and will involve assets from Denmark, France, the United Kingdom, Germany, and others, Rutte said.

“Eastern Sentry will add flexibility and strength to our posture and make clear that, as a defensive alliance, we are always ready to defend,” he added.

Rutte said that Russia’s “dangerous and unacceptable” drone incursion on Wednesday was “not an isolated incident.”

“Russia’s recklessness in the air, along our eastern flank, is increasing in frequency,” Rutte said.

NATO’s Supreme Allied Commander Europe, US General Alexus Grynkewich, said the operation, which will be “flexible and agile,” will include enhanced capabilities, integrated air- and ground-based defenses, and increased information-sharing among NATO partners.

Grynkewich noted that it will take some time for the entire operation to come together, but the first steps will begin “immediately.”

Among the equipment dedicated to the operation are two F-16 fighter jets and an anti-air warfare frigate from Denmark, three Rafale jets from France, and four Eurofighters from Germany, according to a press release from the alliance.

“Although the immediacy of our focus is on Poland, this situation transcends the border of one nation. What affects one ally affects us all,” Grynkewich said.

The initiative is modeled after the “Baltic Sentry” operation that NATO launched earlier this year in response to the sabotage of cables in the Baltic Sea, Grynkewich said.

“Poland and citizens from across the Alliance should be assured by our rapid response earlier this week and our significant announcement here today,” he said. “NATO will continue to defend every inch of its territory.”

The operation will cover the entire eastern flank of NATO states, “from the high north to the Black Sea and the Mediterranean,” Grynkewich said. “Across the eastern flank, we’ll constantly adjust and change our posture in a manner that keeps the adversary off guard but also responds to specific threats as we see them emerging,” he said.

Drone incursion ‘wasn’t’ a mistake

Polish Prime Minister Donald Tusk on Friday called the Russian drone incursion into his country an “attack” and said it wasn’t a mistake, just hours after US President Donald Trump suggested the airspace violation could have been accidental.

“We would also wish that the drone attack on Poland was a mistake. But it wasn’t. And we know it,” Tusk said in a social media post.

Poland has information indicating that Russia launched as many as 21 drones at the country on Wednesday, but not all were found, the head of Poland’s presidential International Policy Office, Marcin Przydacz, told local media. It’s possible that some drones went back and forth crossing the airspace, Przydacz said in an interview with Radio ZET on Friday.

Polish officials previously said that there were 19 intrusions of the country’s airspace, and that a large proportion of the drones entered from Belarus. A total of 16 drones were found throughout the country, Poland’s interior minister said on Wednesday. The locations where the debris was found span an area of hundreds of square miles.

It comes after Trump told reporters at the White House on Thursday that it “could have been a mistake, but regardless, I’m not happy about anything having to do with that whole situation, but hopefully it’s going to come to an end.”

Ahead of a Friday UN Security Council meeting on the incursion, the US joined dozens of other governments in signing a statement expressing “grave concern” over Russia’s actions.

“Such a provocation is profoundly disrespectful toward the collective and tireless efforts of the international community to bring an end to the war and to restore peace and stability in accordance with international law,” Poland’s Secretary of State Marcin Bosacki said on Friday from New York.

Dorothy Shea, the US Ambassador to the UN, told the Security Council that Russia’s intensified strikes on Ukraine and violation of Polish airspace “show immense disrespect for good faith US efforts to bring an end to this conflict.”

Russia’s UN envoy Vasily Nebenzya said Poland “hastily blamed” Russia without providing evidence. “The maximum range of the drones used in this strike did not exceed 700 kilometers, which makes it physically impossible for them to have reached Polish territory,” Nebenzya said.

Earlier that day, French Foreign Minister Jean-Noël Barrot summoned the Russian Ambassador to France, Alexey Meshkov, over the issue. During the meeting, Meshkov “categorically rejected the unfounded accusations against Russia of deliberately violating Polish airspace,” Russian state media TASS reported.

Rutte said that NATO’s assessment of Wednesday’s incursion is ongoing.

“Whether or not Russia’s actions were deliberate, Russia violated NATO airspace. Therefore, we must, as NATO, make clear our resolve and our ability to defend our territory,” he said. “And that is exactly what Eastern Sentry is designed to do.”

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CNN’s Darya Tarasova, Antonia Mortensen and Nick Paton Walsh contributed to this report.