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Trump鈥檚 war in Iran puts new strain on alliances. Why this time it鈥檚 different.

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Doug Mills/The New York Times/AP
President Donald Trump speaks about the Iran war from White House in Washington, April 1, 2026.

Donald Trump has long questioned the value of the United States鈥 military and security alliances 鈥 at least as far back as 2016, when, not yet president, he dismissed NATO as 鈥渙bsolete.鈥

But the president鈥檚 derision of America鈥檚 alliances and dismissal of their utility 鈥 in particular that of NATO and European partners 鈥 in the wake of his war in Iran have many officials and analysts concluding that, this time, it鈥檚 different.

Mr. Trump, they say, has gone so far in his actions and comments that a divide has formed from which there will be no going back.

Why We Wrote This

America鈥檚 European allies have mostly found ways to appease President Donald Trump when he鈥檚 questioned the value of U.S. alliances, especially NATO. Yet amid the bitter rhetoric and growing divide over the Iran war, there鈥檚 a sense the damage might be irreparable.

鈥淭he Europeans are fed up. There鈥檚 an exasperation, but there鈥檚 also a growing sense that Trump is pushing the limits that make this something of a different order,鈥 says Max Bergmann, director of the Europe, Russia, and Eurasia Program at the Center for Strategic and International Studies in Washington.

鈥淚 know the analogy of a divorce has been used a lot,鈥 he adds, 鈥渂ut that may be because it is quite apt when what we鈥檙e seeing is much like the breakup of a long marriage.鈥

Over recent weeks, the president has dismissed NATO as a 鈥減aper tiger鈥 and European partners as weaklings lacking the fortitude to take up arms alongside their longtime protector. His criticism has turned to expressions of rage as NATO members from Britain to France and Spain have denied airbase access to U.S. aircraft undertaking missions in the war.

In a televised address on Wednesday evening, Mr. Trump admonished Europe to 鈥渂uild up some delayed courage鈥 and take action to open up the vital Strait of Hormuz on their own. He said the U.S. has 鈥減lenty of oil鈥 and as a result is not affected by Iran鈥檚 closure of the strait 鈥 a dubious claim according to many economists. He also said European nations depend on the oil that passes through it, so they should 鈥渢ake it.鈥

NATO, again

In an interview on Wednesday with the conservative British newspaper The Telegraph, Mr. Trump said he is 鈥渟eriously considering鈥 pulling the U.S. out of NATO. Speaking Tuesday with Fox News, Secretary of State Marco Rubio questioned 鈥渢he value of NATO鈥 and said the U.S. would need to 鈥渞e-examine鈥 its commitment to the alliance once the Iran war is over.

For their part, Europeans say they are not wavering from their decision not to get involved in a war they believe was not necessary, that they were not consulted on, and which now has triggered an avoidable global economic crisis.

Virginia Mayo/AP
NATO Secretary-General Mark Rutte takes questions from journalists at the transatlantic alliance's headquarters in Brussels, March 26, 2026.

鈥淥n the European side, there is less of the shock that people felt over past belligerent remarks by Trump, and more determination not to give in to the intimidation but to follow what we have decided is the right course for us,鈥 says Sven Biscop, director of the Europe in the World program at Egmont 鈥 The Royal Institute for International Relations in Brussels.

鈥淭he pressuring of NATO and the threats to leave it are more explicit than ever,鈥 he adds, 鈥渂ut leaders are quite adamant about not getting pulled into the war in Iran.鈥

President Trump will have an opportunity to discuss his deepening doubts about the alliance this week when NATO Secretary-General Mark Rutte visits the White House for a long-scheduled meeting.

Mr. Trump has developed a warm relationship with Mr. Rutte, who courted the president at last June鈥檚 NATO summit with effusive flattery and commitments to boosting European members鈥 鈥渇air share鈥 of alliance spending.

But he has fared less well with European leaders who face mounting political pressures at home not to roll over for a deeply unpopular American president and his equally unpopular war.

Their refusal to accommodate the U.S. president on Iran has prompted sharp rebukes from Mr. Trump of a number of European leaders.

Barbed exchange with Macron

Mr. Trump has become particularly derisive of French President Emmanuel Macron 鈥 a leader with whom he once enjoyed a cordial relationship 鈥 for not joining the U.S. in the Iran war.

The president mocked Mr. Macron at a private event on Wednesday and then singled out France as a laggard in his address that night. Mr. Macron fired back on Thursday with his own tart riposte, telling journalists, 鈥淭his is not a show. We are talking about war and peace. ... When you want to be serious,鈥 he continued, 鈥測ou don鈥檛 say every day the opposite of what you said the day before.鈥

Lee Jin-man/AP
French President Emmanuel Macron and his wife, Brigitte Macron, arrive in South Korea, April 2, 2026. Mr. Macron and U.S. President Donald Trump have traded criticisms in recent days over U.S. military operations in the Middle East.

Dr. Biscop cites a 鈥渂itterness鈥 across Europe that Mr. Trump is disengaging from the war in Ukraine 鈥 where Western Europe faces its primary adversary, Vladimir Putin鈥檚 Russia 鈥 even as he pursues a war that is enriching Russia, easing the pressures on Mr. Putin to end his conflict.

And privately, some European officials are sharing mounting consternation over the U.S. conduct of the Iran war that they say with each passing week is moving further away from the international rules of engagement and values that underpin the NATO alliance.

Mr. Trump has threatened to blast Iran 鈥渂ack to the stone ages鈥 and obliterate the country鈥檚 power plants and other civilian infrastructure. These are the same kinds of attacks Mr. Putin has carried out ruthlessly in Ukraine, the European officials note, that have brought rising accusations of war crimes.

As the Iran war accelerates a fraying of transatlantic ties, two different schools of thought on how to respond are emerging among European allies, Mr. Bergmann says.

One side of the 鈥渟plit鈥 is calling for Europe to 鈥渇ace the music鈥 and move ahead with steps to build its own defense, he says. That camp includes Mr. Macron, who has called on Europeans to build a 鈥渟trategic autonomy.鈥 The other half 鈥 typified by Mr. Rutte 鈥 cautions against alienating the U.S., especially when Europe simply is not ready to defend itself.

Carrying the traditional marriage analogy further, Mr. Bergmann says the reality is that the U.S., which for decades discouraged any efforts at building a European defense, is like 鈥渢he husband who would never let his wife get a job and develop skills outside the home, but now ... suddenly has turned critical of her for not taking a job.鈥

A changed alliance

Others say a realism about a permanently changed alliance has already sunk in.

鈥淭here鈥檚 definitely a growing awareness that, at some level, there is already a structural change at NATO,鈥 Dr. Biscop says. 鈥淭he emerging consensus is that the U.S. will continue to provide a nuclear umbrella, but that European militaries will have to provide Europe鈥檚 first line of defense.鈥

Some experts say the Iran war and the way it might have accelerated a U.S. turn away from alliances should also prompt fresh thinking among America鈥檚 Arab partners in the Gulf about their strategic dependence on the U.S.

President Trump鈥檚 statement in his televised address that 鈥渨e don鈥檛 need the Middle East鈥 should be heeded, some say.

鈥淥ne of the things [the Gulf states] could do ... is to become better integrated in their defense capabilities,鈥 says retired Army Gen. Joseph Votel, former head of U.S. Central Command. 鈥淭hey are still focused on defending themselves and not thinking of themselves as a bloc.鈥

The Gulf states could 鈥渦se this example鈥 to 鈥渄o more to tie themselves together,鈥 says General Votel, now a distinguished military fellow at the Middle East Institute in Washington. More integrated air defenses, maritime capacity, and intelligence sharing, he says, would be the path for them to 鈥渢aking more responsibility for the Gulf.鈥

As for Europe, Mr. Bergmann says America鈥檚 partners there feel like they have heeded Washington鈥檚 call under President Trump for them to take more responsibility for their defense. But he says there鈥檚 a growing sense that what Mr. Trump really wants is unquestioned fealty 鈥 and that, he says, is not going to happen.

鈥淓urope has stepped up and replaced U.S. funding in Ukraine, for example,鈥 Mr. Bergmann says. 鈥淏ut taking more responsibility is one thing. It doesn鈥檛 mean they鈥檙e going to approach the U.S. on bended knee.鈥

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