President Trump’s war against Iran has drained U.S. weapons stockpiles to levels that have privately alarmed senior officials, forcing the Pentagon to pull air-defense missiles, ships and aircraft out of Europe and Asia to sustain the fight. The result, according to senior American and Western officials, is a marked erosion of U.S. military readiness in two of the world’s most volatile regions, one that is already delaying weapons deliveries to allies and reshaping how Moscow and Beijing weigh the risks of confronting Washington.
The strain traces back to Feb. 28, when the United States joined Israel in striking Iran. Mr. Trump predicted victory within weeks. More than five months later, the war grinds on, and the munitions bill has come due. Bombing Iran consumed thousands of multimillion-dollar missiles built from precision components sourced through a global supply chain that can take years to replenish. Defending against Iran’s retaliatory missile barrages has been just as costly, burning through U.S. air-defense interceptor stocks at a pace officials did not anticipate.
A Warning Delivered, and Overruled
Before the war began, Gen. Dan Caine, the chairman of the Joint Chiefs of Staff, warned the president directly about the risks of drawing down already-strained stockpiles, according to two officials familiar with the exchange. Mr. Trump proceeded anyway, convinced the campaign would be short. A spokesman for General Caine declined to discuss the private conversation. The shortage that followed is now believed to have influenced Mr. Trump’s decision late last month to shelve a planned major bombing campaign against Iran, even as the broader conflict — and the drain on U.S. firepower — continues.
The scale of that drain came into sharper focus in the following months. Multiple defense-industry and government accounts indicate that during the opening days of the war, coalition forces expended Patriot interceptors at a rate that vastly outpaced production, leaving a steep gap between what was being fired and what Lockheed Martin’s assembly lines could replace. Lockheed’s Camden, Arkansas plant was producing roughly 1.7 interceptors a day even as coalition forces burned through an estimated 225 Patriot rounds daily during the war’s first four days. By April, stockpiles of Patriot interceptors had fallen to roughly a quarter of the level the Pentagon considers necessary, a shortfall that forced the military to ration one of its most relied-upon air-defense systems even as demand for it kept climbing.
Denial in Public, Alarm in Private
Publicly, the Trump administration has rejected any suggestion of a crisis. Karoline Leavitt, the White House press secretary, said the United States has “more than enough firepower to carry out any operation the president orders at any time and place.” Sean Parnell, the chief Pentagon spokesman, similarly dismissed reports of shortages as false, saying the U.S. has “everything required to strike at the time and place of the president’s choosing.”
Behind that public posture, officials describe a president who has grown furious over coverage of the shortages. Mr. Trump has ordered a sweeping leak investigation across the government and is demanding criminal prosecutions of anyone found to have disclosed sensitive munitions details. He has told advisers privately that discussing the shortage signals weakness to adversaries, while continuing in public to deny the problem exists or to pin it on his predecessor, Joseph R. Biden Jr. “Our defense companies are making more munitions than ever before, while rapidly expanding their plants and equipment at record levels,” Ms. Leavitt said in a statement, adding that leakers “should be prosecuted to the fullest extent of the law.”
Experts caution that whatever the administration’s public messaging, the underlying math is difficult to dispute. Tom Karako, a senior fellow at the Center for Strategic and International Studies who has tracked U.S. weapons inventories, described the depletion as a “generational annihilation of the means of conventional deterrence.” He said the effect on decision-making in Moscow and Beijing “could resonate for years,” adding: “It’s impossible for that not to have a significant effect on the decision calculus of Russia and China. They may do something quite deliberate and at the time of their choosing, because keep in mind — we’re going to take years to reconstitute.”
Ukraine Feels the Shortage First
Nowhere has the shortage’s human cost been clearer than in Ukraine. President Volodymyr Zelensky said this week that Western allies have cut the flow of air-defense missiles to his country by roughly a third compared with 2025. On Wednesday, Ukrainian forces failed to intercept any of the 28 missiles Russia fired in a single barrage, killing at least 17 people. Mr. Zelensky said more interceptors “could have saved the lives of those killed today.”
Analysts point to a widening mismatch: Russia has scaled up missile production faster than Ukraine’s Western backers have been able to manufacture air-defense systems to counter it, and the Iran war has made that gap worse by pulling supply toward the Middle East. Representative Jason Crow, a Colorado Democrat on the House Armed Services and Intelligence Committees, faulted what he called an “antiquated” U.S. defense procurement system that “doesn’t allow us to actually keep pace with the rapidly evolving nature of warfare.” He added, “Frankly, our adversaries don’t have those hindrances.” Asked in the Oval Office on Thursday about Mr. Zelensky’s request for more missiles, Mr. Trump replied bluntly: “We want missiles too.”
The Numbers Behind the Shortfall
Mr. Trump has repeatedly blamed Mr. Biden’s support for Ukraine for the current shortfall, writing on social media Thursday that the U.S. holds “massive amounts of ‘munitions,’ especially of certain types.” That is true for some categories of weapons — the U.S. arsenal includes more than 100,000 guided bombs dropped from aircraft, according to the Center for Strategic and International Studies. But those weapons must be released close to their targets, exposing aircraft and pilots to greater risk. Longer-range weapons that avoid that exposure, including Army Tactical Missile Systems (ATACMS) and Precision Strike Missiles, were largely exhausted during the Iran campaign — a category officials consider critical in any future conflict with a more capable adversary than Iran.
Even with accelerated production efforts, replenishment will take years. More than 1,500 Patriot interceptor missiles have been expended in the Iran war, against a current U.S. inventory of fewer than 1,700, according to two people briefed on the stockpile. Officials estimate it could take more than two years to rebuild that reserve to prior levels.
Washington Moves to Rebuild the Arsenal
The Pentagon has since moved to accelerate weapons production on a scale not seen in decades. In March, the Department of Defense struck a sweeping set of production agreements with Lockheed Martin, BAE Systems and Honeywell aimed at quadrupling output of some of the country’s most critical missile systems over seven years, including plans to expand Precision Strike Missile production from roughly 45 units a year to 550, and to more than quadruple THAAD interceptor output from 96 to 400 annually.
Patriot interceptors have drawn the most urgent attention. In January, Lockheed Martin reached a seven-year agreement with the Department of War to raise PAC-3 MSE production capacity from about 600 units a year to 2,000, and by late July that commitment had been converted into a $58.6 billion, seven-year contract running through fiscal year 2032 — one of the largest missile-procurement agreements ever signed. At roughly $3.87 million per interceptor, replenishing stockpiles at that scale carries an extraordinary price tag. A parallel agreement with RTX aims to expand Tomahawk cruise missile production from about 60 units a year toward an eventual 1,000. Even so, officials and analysts widely agree that full recovery of stockpiles will extend well beyond the current administration.
Asia’s Quiet Drawdown
The long-term consequences may be most severe in the Pacific, where the U.S. has spent years preparing for a potential Chinese move against Taiwan. U.S. Indo-Pacific Command became a significant source of munitions for the Iran campaign, with many of its Tomahawks and other long-range missiles — weapons considered essential in any confrontation with China — redirected out of the region. Hundreds of advanced air-defense interceptors were pulled from South Korea and elsewhere in Asia, while a carrier strike group and several of the Navy’s most capable destroyers were reassigned from the Pacific to support Middle East operations. A U.S. official said troops stationed in South Korea are now more exposed in the event of a conflict with North Korea, after the Pentagon redirected tactical surveillance assets and withdrew air-defense systems from the peninsula.
Some U.S. officials worry the drawdown could shake allied confidence in America’s security guarantees. In Asia, officials fear that Japan and South Korea, doubting Washington’s ability to defend them with conventional forces, may feel greater pressure to pursue independent nuclear deterrents. In Europe, allied governments are already looking beyond U.S. suppliers, seeking to diversify weapons purchases given the backlog in American production.
What Moscow and Beijing Are Watching
Russian and Chinese officials have long tracked the limits of U.S. weapons stockpiles through open sources such as congressional budget documents and defense-contractor announcements, as well as through satellite and other surveillance, according to a U.S. official familiar with defense intelligence. Officials say both governments now understand that American inventories will take years to rebuild to levels needed to execute certain existing war plans — a reality that, some analysts argue, gives Moscow and Beijing an incentive to see the Iran conflict continue rather than end.
“The longer this war runs and the more we continue to exchange fire with Iran, the worse the munitions problem becomes for the United States, and the larger and more visible this window of vulnerability becomes,” said Todd Harrison, a defense analyst at the American Enterprise Institute. A prominent Russian pro-war blogger, Aleksandr Kots, put it more bluntly online: “The situation is shaping up very favorably. The less precision-guided weaponry the U.S. has, the less will reach Ukraine.” He added that even a future U.S. administration eager to expand aid to Kyiv would find “doing so will be impossible with empty arsenals.”
A Reassessment Already Underway
Dara Massicot, an expert on the Russian military at the Carnegie Endowment for International Peace who recently returned from Ukraine, said Moscow had already begun reassessing its assumptions about U.S. stockpiles well before the Iran war began, after four years of watching the pace of American weapons production during the war in Ukraine. That experience, she said, may have convinced Russian planners that the United States is slower to ramp up production than they previously believed — a perception she warned carries real strategic risk. “That’s the wrong kind of math to go into the Russian system, because then they start changing their perception of their own power vis-à-vis NATO,” Ms. Massicot said. “It causes them to come to conclusions that we may not want them to.”
As of early August, the war in Iran remains unresolved. Washington and Tehran have traded accusations over a collapsed ceasefire and stalled negotiations over the Strait of Hormuz, with Mr. Trump on Aug. 1 describing the U.S. military as “locked and loaded and ready” to strike again before agreeing to hold off to pursue a deal. Whether or how soon that standoff ends will help determine how much further the strain on American weapons stockpiles — and on the allies depending on them — is allowed to grow.