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NATO has announced a new operation to reinforce its eastern defenses following a Russian drone incursion into Polish airspace earlier this week. Secretary General Mark Rutte and Supreme Allied Commander Europe (SACEUR) General Alexus G. Grynkewich unveiled the initiative, called “Eastern Sentry,” at a joint press conference on September 12, 2025.

The announcement came two days after Poland reported at least 19 violations of its airspace by Russian drones, prompting Warsaw to call for Article 4 consultations at NATO. Polish officials described the incident as the most serious violation of alliance airspace to date and warned it was unlikely to have been accidental.

“Eastern Sentry will add flexibility and strength to our posture and make clear that, as a defensive alliance, we are always ready to defend,” Rutte said. He explained that the operation would combine traditional military capabilities with advanced technologies to counter the growing threat posed by unmanned aerial vehicles.

A Growing Threat to NATO’s Eastern Flank

The airspace violations occurred on the night of September 9–10, when Polish forces detected numerous Russian drones crossing into its territory, many believed to have entered from Belarus. Warsaw said debris from 16 drones had been recovered across an area stretching hundreds of square miles.

Officials added that Russia may have launched as many as 21 drones, some of which may have crossed in and out of Polish airspace multiple times.

Polish Prime Minister Donald Tusk rejected suggestions that the incursion was accidental. “We would also wish that the drone attack on Poland was a mistake. But it wasn’t. And we know it,” he wrote on social media.

The NATO secretary general described the incident as part of a pattern of increasing Russian provocations. “What happened on Wednesday was not an isolated incident. Russia’s recklessness in the air along our eastern flank is increasing in frequency,” he said.

Rutte reminded reporters that NATO’s deterrence posture already includes forward land forces in eight countries, with contributions from every Ally, and scalable plans for reinforcement. “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.

Scope and Structure of Eastern Sentry

General Grynkewich said Eastern Sentry would be “flexible and agile,” incorporating integrated air and ground defenses, new counter-drone systems, and enhanced information-sharing among allies. “The order went out as this press conference began, and so operations are being brought together immediately underneath my authorities as SACEUR,” he said.

Initial contributions include two F-16s and an anti-air warfare frigate from Denmark, three Rafale jets from France, and four Eurofighters from Germany. Ground-based air-defense systems are also expected to be deployed.

Grynkewich stressed that the aim was not only to add forces but to create an integrated design that could close gaps, concentrate resources quickly, and ensure seamless coordination across NATO’s eastern flank.

“This is going to be a comprehensive and integrated approach,” he said. “We’ll be able to plug gaps in the line, concentrate forces where we need to, and ensure much better communication across the entire eastern flank so that it’s truly an integrated defense.”

The operation will span the alliance’s entire eastern border, “from the High North to the Black Sea and the Mediterranean,” Grynkewich confirmed.

He compared it to the “Baltic Sentry” activity launched earlier this year after sabotage of cables in the Baltic Sea, noting that NATO would again work with Allied Command Transformation to experiment rapidly with technologies such as counter-drone sensors and weapons.

Mixed Reactions Among Allies

The United States expressed support but struck a cautious tone about Russia’s intentions. President Donald Trump suggested the violation “could have been a mistake, but regardless, I’m not happy about anything having to do with that whole situation.” His remarks contrasted with those from Polish leaders, who insisted the incident was deliberate.

At the United Nations Security Council on Friday, Poland’s Secretary of State Marcin Bosacki described the incursion as a serious provocation. “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,” he said.

U.S. Ambassador to the UN Dorothy Shea accused Russia of showing “immense disrespect for good faith the United States efforts to bring an end to this conflict” through its intensified strikes on Ukraine and its violation of Polish airspace.

Russia rejected the accusations. Ambassador Vasily Nebenzya told the Security Council that Poland “hastily blamed” Moscow without evidence. He argued that the drones used had a maximum range of 700 kilometers, making it “physically impossible” for them to reach Polish territory.

In Paris, French Foreign Minister Jean-Noel Barrot summoned Russia’s ambassador to demand explanations, but Russian state media reported that he “categorically rejected” the accusations.

Learning from the Incursion

The incursion has raised concerns about the costs of deploying NATO’s advanced systems against cheap Russian drones. Grynkewich described Poland’s defensive response as a success but admitted that the alliance would keep learning from each encounter.

“The scale of the incursion the other day was obviously larger than previous incursions that we’ve had,” he said. “So, bringing additional resources to bear on this problem will help to solve that.”

He also addressed questions about U.S. military contributions to Eastern Sentry, noting that while no American assets had been directly involved in the recent operation, the United States’ commitment to NATO’s integrated structure remained unchanged. “As far as those military assets, I’m right here and I’m involved, and the United States’ commitment to the integrated military structure of the alliance remains,” he said.

Poland Boosts Domestic Ammunition Production

Alongside NATO’s military measures, Poland is also expanding its defense industrial base. Polska Grupa Zbrojeniowa (PGZ) and BAE Systems announced on Friday a strategic partnership to build a new 155mm artillery ammunition manufacturing plant in Poland. The facility will use BAE’s advanced automated technology, already in operation in the UK, which enables a sixteen-fold increase in shell production.

The agreement will allow Poland to produce between 150,000 and 180,000 large-caliber shells annually, ensuring greater supply chain sovereignty and reducing reliance on foreign suppliers. BAE Systems will transfer technology and expertise, while PGZ will lead domestic operations, creating hundreds of skilled jobs.

“This is not only important for Poland’s own national defense but will also help to enhance its contribution to securing NATO’s eastern flank,” said Adam Leszkiewicz, President of PGZ. He emphasized that the decision reflected both production sovereignty and the long-term development potential of Poland’s defense sector.

The 155mm shells, already central to NATO firepower for decades, will be fully compatible with Poland’s self-propelled howitzers such as the K9 and Krab. The UK government welcomed the deal, describing it as a vote of confidence in British industry and part of its broader ambition to deepen defense cooperation with Poland.

Eastern Sentry is expected to begin within days, with assets moving quickly into position. NATO leaders framed the initiative as both a response to the immediate threat against Poland and a broader demonstration of allied unity. “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.

Rutte underlined the broader message behind the initiative: deterrence through readiness and collective defense. “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.”