NATO’s top military commander issued a stark warning Monday, saying the alliance would target “anything and everything” sustaining an attack on allied territory and dismantle an enemy’s warfighting network to prevent any future assault by Russia.
“Should the adversary choose to press the attack or commit his reserves, we will break the warfighting system engaged against us,” U.S. Air Force Gen. Alexus Grynkewich said at the Warsaw Security Forum in Poland, delivering an apparent message to Moscow.
He said NATO’s response would extend beyond troops on the battlefield to include “anything and everything” that supplies, supports or directs an attacking force. Grynkewich made the remarks during a panel titled “Theory of Victory: How Do We Achieve Military Success Against Russia in Deterrence and Defence?” on the forum’s opening day.
NATO’s top military commander said the alliance would destroy “anything and everything” supporting an attack on allied territory and dismantle enemy warfighting systems to deter any potential future Russian assault. (Photo by Artur Widak/Anadolu via Getty Images)
Grynkewich, NATO’s supreme allied commander in Europe, described a three-part approach focused on “blocking, blunting and breaking” hostile forces. His comments underscored that although NATO is a defensive alliance, it is prepared to respond forcefully if any of its 32 members comes under attack.
“If someone is foolish enough to attack us, we will fight,” he said. NATO would halt the assault, prevent the attacker from reaching its goals and ensure that an attack against any ally ultimately failed, regardless of the objective.
The warning came as tensions between Russia and Western countries remain elevated following a series of drone incursions and suspected sabotage incidents that European governments have attributed to Moscow.
“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.
European officials have accused Russia of conducting a broad hybrid-warfare campaign involving sabotage, arson and cyberattacks, while also stepping up military activity near NATO territory.
Grynkewich’s remarks came during a period of heightened friction between Russia and the West, following drone incursions and suspected sabotage operations that European countries have linked to Moscow. (Photo by Artur Widak/Anadolu via Getty Images)
In 2025, several Russian drones crossed into Polish airspace during a major attack on Ukraine, prompting Polish and allied aircraft to respond.
NATO subsequently launched Operation Eastern Sentry to reinforce security along the alliance’s eastern flank.
Romania has likewise reported incursions by Russian drones, while Estonia has accused Russian military aircraft of entering its airspace.
Grynkewich spoke after a tense weekend involving Russia and Ukraine, as Moscow carried out new strikes on Ukrainian energy infrastructure despite diplomatic efforts aimed at easing the conflict.
President Donald Trump said he had reached an agreement with Russian President Vladimir Putin to expand Russian diesel supplies to the United States and international markets.
On Sept. 30, Russia warned NATO that it might resort to nuclear weapons if the alliance sought to isolate Kaliningrad, the heavily militarized Russian exclave on the Baltic Sea between Poland and Lithuania. ( Photo by Contributor/Getty Images)
The reported deal also involved waiving some U.S. sanctions imposed on Russian energy exports.
Ukrainian President Volodymyr Zelenskyy accused Russia of continuing to strike energy facilities, raising doubts about the possibility of a wider ceasefire.
The broader confrontation has also been marked by renewed nuclear threats from Moscow.
On Sept. 30, Russia warned NATO that it could deploy nuclear weapons if the alliance attempted to cut off Kaliningrad, its heavily militarized Baltic Sea exclave located between Poland and Lithuania.
In a diplomatic note obtained by Reuters, Moscow accused NATO of pursuing a “dangerous and reckless course” that carried “high risks of the outbreak of a direct armed conflict.”
According to the note, Russia warned it could use its full military arsenal, including nuclear weapons, to defend Kaliningrad and raised the possibility of strikes against decision-making centers in NATO countries at the outset of a conflict.
The Hague, Netherlands – In photos, NATO leaders participate in the summit in The Hague, Netherlands, on June 25, 2025. NATO countries pledged to increase their defense spending to 5% of GDP by 2035, as demanded by U.S. President Donald Trump. The summit’s final declaration states that countries will invest “at least 3.5%” of their GDP annually in military capabilities and an additional 1.5% in protecting critical infrastructure. (Handout / Latin America News Agency via Reuters Connect)
NATO Secretary-General Mark Rutte rejected the threats, emphasizing the alliance’s defensive mission and calling 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 also maintained that Russia has no plans to attack European countries and wants peaceful coexistence with its neighbors.
Grynkewich did not mention Russia by name during his Warsaw address, but his warning appeared directed at Moscow and with NATO’s 2022 Strategic Concept also identifying 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 on Monday.
“And if required, we will break the enemy’s forces and the operational warfighting system that is arrayed against us.”
Grynkewich said NATO was already putting the strategy into action through military exercises, enhanced military readiness and investments in new capabilities.
NATO Secretary Gen. Mark Rutte attempts to assure President Donald Trump on Wednesday in a news conference that allies are increasing their financial commitments so Europe’s defense is not all on the U.S. taxpayers. (Win McNamee/Getty Images)
“If attacked, we are ready to fight tonight, but we are not complacent,” he said.
The general made clear that NATO’s response would not necessarily be limited to enemy troops directly involved in an assault, but could extend to the broader military infrastructure enabling the attack.
Meanwhile, Trump has pressed European allies to increase defense spending and has questioned whether countries that fail to meet their obligations should expect U.S. protection.
Grynkewich sought to downplay concerns about Washington’s commitment, recalling Trump’s positive remarks about the alliance during the 2025 NATO summit in The Hague, Netherlands.
“I was in the room and I felt the love,” Grynkewich said of the 2025 event.
“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,” he added.
He also indicated a willingness 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.
The Warsaw Security Forum brought together European political and defense leaders as the continent grappled with Russia’s continuing war in Ukraine and the growing threat of confrontation along NATO’s eastern flank.