NATO’s top military commander delivered a blunt warning Monday, declaring that the alliance would destroy everything supporting an attack on allied territory and break the enemy systems behind any assault, as reported by Fox News.

U.S. Air Force Gen. Alexus Grynkewich issued the warning during the Warsaw Security Forum in Poland. His remarks appeared aimed at Moscow as tensions continue between Russia and Western nations.

“Should the adversary choose to press the attack or commit his reserves, we will break the warfighting system engaged against us,” Grynkewich said.

“This includes not just the attacking force itself, but anything and everything that supports, sustains, and controls that force,” he added during a panel titled “Theory of Victory: How Do We Achieve Military Success Against Russia in Deterrence and Defence?”

Grynkewich, NATO’s supreme allied commander in Europe, described a three-part strategy built around blocking, blunting and breaking enemy forces. Although NATO is a defensive alliance, he said it is prepared to answer an attack against any of its 32 members.

“If someone is foolish enough to attack us, we will fight,” Grynkewich said.

“We will stop the attack and deny them the ability to achieve their objectives, whatever those might be. We will, in short, ensure any attack against any ally proves utterly futile.”

The warning arrived amid heightened tensions following drone incursions and suspected sabotage operations that European countries have linked to Moscow.

European officials have accused Russia of conducting hybrid warfare through sabotage, arson and cyberattacks while increasing provocative military activity near NATO territory.

“We stand here together in Poland today stronger than ever united in our common vision of a more balanced, more ready and more lethal alliance,” Grynkewich said.

In 2025, multiple Russian drones entered Polish airspace during a large-scale attack on Ukraine, prompting Polish and allied aircraft to respond. NATO subsequently launched Operation Eastern Sentry to strengthen defenses along the alliance’s eastern flank.

Romania has also reported Russian drone incursions, while Estonia has accused Russian military aircraft of violating its airspace.

Grynkewich’s address followed a tense weekend in which Moscow launched fresh strikes against Ukrainian energy infrastructure despite diplomatic efforts to reduce hostilities.

President Donald Trump had announced that he reached an agreement with Russian President Vladimir Putin to increase Russian diesel supplies to the United States and global markets.

The reported agreement included a waiver of certain U.S. sanctions on Russian energy exports.

Ukrainian President Volodymyr Zelenskyy accused Russia of continuing attacks against Ukrainian energy facilities, raising doubts about prospects for a broader ceasefire. At the same time, recent nuclear warnings from Moscow have added another layer of tension.

On Sept. 30, Russia warned NATO that it could use nuclear weapons if the alliance attempted to isolate Kaliningrad, Russia’s heavily militarized Baltic Sea exclave between Poland and Lithuania.

In a diplomatic note obtained by Reuters, Moscow accused NATO of pursuing a “dangerous and reckless course” carrying “high risks of the outbreak of a direct armed conflict.”

According to the note, Russia said it could use its full military arsenal, including nuclear weapons, to defend Kaliningrad. Moscow also raised the possibility of striking decision-making centers in NATO countries at the beginning of a conflict.

NATO Secretary-General Mark Rutte rejected Russia’s threats, stressed the alliance’s defensive mission and called on Moscow to end its war in Ukraine.

“Putin knows that he can never win from NATO,” Rutte said during a Sept. 30 appearance at the Euronews Defence and Space Summit.

Putin has maintained that Russia has no plans to attack European nations and wants peaceful coexistence with neighboring countries.

Grynkewich did not name Russia during his Warsaw address, but NATO’s 2022 Strategic Concept identifies Russia as the most significant and direct threat to allied security.

“My theory of victory is simple: we will block the initial attack. If the attack persists, we will blunt it and prevent enemy advance,” Grynkewich said. “And if required, we will break the enemy's forces and the operational warfighting system that is arrayed against us.”

Grynkewich said NATO is putting that strategy into action through military exercises, increased readiness and investments in new capabilities. “If attacked, we are ready to fight tonight, but we are not complacent,” he said.

The general indicated that NATO’s response could reach beyond troops directly involved in an attack and extend to the wider military infrastructure enabling it.

His warning came as Trump continues pressing European allies to increase military spending.

At the 2025 NATO summit in The Hague, allied countries pledged to raise military spending to 5% of gross domestic product by 2035.

The summit declaration said countries would invest at least 3.5% annually in military capabilities and another 1.5% in protecting critical infrastructure.

Grynkewich sought to ease concerns about Washington’s commitment by recalling Trump’s positive comments during that summit. “I was in the room, and I felt the love,” he said.

“What I want to do is assure the one billion citizens of our alliance that we've got this. We know what we need to do. We know how we would do it,” Grynkewich added.

He also said he was willing to discuss suspected hybrid attacks more openly if individual NATO governments wanted him to address their concerns.

“If a nation wants me to, I'm happy to talk about it,” he said.

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