This is part one of a series examining the challenges confronting the NATO alliance.
NATO has become a “bloated architecture” too dependent on American military power, former senior national security advisor Keith Kellogg told Fox News Digital.
As President Donald Trump pressures NATO allies to spend more on defense — ordering the withdrawal of 5,000 U.S. troops from Germany and signaling possible cuts in Spain and Italy — a deeper concern is emerging inside the alliance: despite years of rising European defense budgets, NATO still depends heavily on American military power, from missile defense and intelligence to logistics and nuclear deterrence.
The growing gap between political commitments and real military capability is now fueling calls for structural changes inside the alliance as NATO confronts mounting threats from Russia and instability in the Middle East.
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NATO’s imbalance is not theoretical — and it is not new, retired Lt. Gen. Keith Kellogg told Fox News Digital, “I told the president… maybe you ought to talk about a tiered relationship with NATO,” Kellogg described conversations with Trump in his first term about the alliance’s future. “…we need to develop a new, for lack of a better term, a new NATO a new defensive alignment with Europe.“
Kellogg added the alliance has expanded politically but not militarily — creating what he sees as a growing gap between commitments and real capability.
“You started with 12, and you went to 32, and in the process, I think you diluted the impact,” he argued, calling today’s NATO “a very bloated architecture.”
“They haven’t put the money into defense. Their defense industry and defense forces have atrophied. When you look at the Brits right now, they could barely deploy forces: they have two aircraft carriers, both under maintenance. Their brigades are like one out of six that work. And you just look at the capability, it’s just not there. So I think we need to realize that and say, well, we need something different,” Kellogg, who is the co-chair of the Center for American Security at the America First Foreign Policy Institute, told Fox News Digital.
But not everyone agrees the alliance is losing relevance.
“It has never been more relevant,” said John R. Deni, a research professor at the U.S. Army War College, who says NATO remains central to U.S. national security.
“The reason for that is twofold,” he said. “One, it’s our comparative advantage versus the Chinese and the Russians… they don’t have anything like this.”
“And the second reason… NATO underwrites the security and stability of our most important trade and investment relationship,” he added, referring to economic ties between North America and Europe.
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By around 2010, the United States accounted for roughly 65% to 70% of NATO defense spending, according to analysis provided by Barak Seener from the Henry Jackson Society, a London-based think tank.
“They’ve always been dependent on the U.S.,” Kellogg said of the European allies.
“The allies overall rely upon one another for deterrence and defense by design,” Deni said, explaining that alliances exist to “pool their resources” and “aggregate their individual strengths.”
Deni pointed to ground forces as a clear example of what the U.S. gains from the alliance, noting that “there are far more allied mechanized infantry forces on the ground than there are Americans.”
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Still, he acknowledged that reliance has at times gone too far.
“In the past… it was fair to say that the European allies were overly reliant upon the Americans for conventional defense,” he said, pointing to the 2000s.
That, he said, was partly driven by U.S. priorities — as Washington pushed European allies to focus on wars in Afghanistan and Iraq rather than territorial defense.
Seener describes NATO as “formally collective, but functionally asymmetric,” with the U.S. providing a disproportionate share of “high-end capabilities.”
That asymmetry is most visible in nuclear deterrence.
Seener said the U.S. provides the overwhelming majority of NATO’s nuclear arsenal — including intercontinental ballistic missiles, submarine-launched systems and strategic bombers — meaning deterrence ultimately relies on the assumption of U.S. retaliation.
A NATO official told Fox News Digital that, “The U.S. nuclear deterrent cannot be replaced, but it is clear that Europe needs to step up. There’s no question. There needs to be a better balance when it comes to our defense and security. Both because we see the vital role the U.S. plays around the world and the resources that it demands, and also because it is only fair.”
“The good news,” the official added, “is that the Allies are doing exactly that. They are stepping up, working together — and with the U.S. — to ensure we collectively have what we need to deter and defend one billion people living across the Euro-Atlantic area.”
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Beyond nuclear weapons, the dependence runs through the alliance’s operational backbone.
Seener pointed to U.S.-provided intelligence, surveillance and reconnaissance — as well as logistics and command systems — as essential to NATO operations.
“Without U.S. intelligence and surveillance, NATO loses situational awareness and early warning capabilities,” Seener said, adding, “So that means that Russia, for example, can attack Europe. And theoretically, if there’s no NATO and the U.S. is not involved, Europe would not be aware, or it would take it too long to be able to defend itself.”
Kellogg also says that much of Europe’s military capability falls short of top-tier systems.
“For the most part, their equipment, if you had to grade it A, B, C, D, E, F, they’re kind of like B players or C players,” he said. “It’s not the first line of work.”
He pointed to air and missile defense as a key gap, noting that while European countries rely on U.S.-made systems such as Patriot and THAAD, “they don’t have a system that’s comparable.”
Kellogg attributed that to years of underinvestment, saying European defense industries “have atrophied,” adding that the United States is also now “relearning that as well.”
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Deni said the picture today is more mixed.
“Alliance defense spending has been up… and has spiked far more after 2022,” he said, pointing to Russia’s invasion of Crimea in 2014 as a turning point.
But he cautioned that capability gains take time, noting that many improvements are still years away from full deployment.
Deni pointed to recent European purchases of U.S. systems as evidence of growing capability, noting that countries including Poland, Romania, Norway and Denmark are acquiring the F-35 fighter jet from the U.S.
“You can’t build an F-35 overnight,” he said, adding that many of these improvements will take years to fully materialize.
A NATO official told Fox News Digital the alliance “needs to move further and faster” to meet growing threats, pointing to new capability targets agreed by defense ministers in June 2025.
The official said priorities include air and missile defense, long-range weapons, logistics and large land forces, noting that while details remain classified, plans call for a fivefold increase in air and missile defense, “thousands more” armored vehicles and tanks, and “millions more” artillery shells. NATO also aims to double key enabling capabilities such as logistics, transportation and medical support.
The official added that allies are increasing investments in warships, aircraft, drones, long-range missiles, as well as space and cyber capabilities, while boosting readiness and modernizing command and control.
“These targets are now included in national plans,” the official said, adding that allies must demonstrate how they will meet them through sustained defense spending and capability development.
The NATO official also noted that European allies lead multinational forces across Central and Eastern Europe, while the U.S. and Canada serve as framework nations in Poland and Latvia, alongside ongoing air policing missions and NATO’s KFOR operation in Kosovo.
Kellogg’s warning is direct: NATO’s deterrence depends on U.S. presence.
“The one you always have to worry about… is Russia,” Kellogg, who was Trump’s special envoy for Ukraine and Russia in 2025, said.
If U.S. forces are tied down elsewhere, NATO could face serious strain — particularly in areas like intelligence and logistics.
For Kellogg, the danger is delay. “We won’t know until it happens,” he said. “And then you won’t be able to respond to it.”
Deni, however, said the alliance remains a strategic asset — not a liability.
The question, he suggests, is not whether NATO still works. It is whether allies can adapt fast enough to keep it working.
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