Ukrainian President Volodymyr Zelenskiy has asked Washington for an emergency package of 300 Patriot missiles before winter, warning that Ukraine’s reserves are running dangerously low and that the country cannot reliably defend itself against Russian ballistic missiles without them.

During a heavy bombardment of Kyiv at the weekend that killed nine people, Ukraine was only able to bring down one of the 50-odd missiles Russia fired, in a testament to how low its stock of air defence ammo is.

But Zelenskiy’s request has landed at a bad time for the White House as America’s stock of the sought after missiles is also running dangerously low after heavy expenditure in the Iran war. Able to only produce about 600 new PAC-3 interceptor missiles a year, the production bottleneck has seen the order book back up for years to come.

Trump added a further layer of uncertainty on July 31 when he said he was “not sure” whether Washington would allow Ukraine to make Patriot interceptors domestically, retreating from a pledge he had made at the Nato summit in Ankara earlier in July.

“It’s a very extraordinary weapon, and we have to be a little bit careful of who we license it to. We don’t really license equipment,” Trump told the Financial Times.

“I’m not looking for missiles. We’re looking for peace,” he added, saying that his priority was ending the war rather than expanding Ukraine’s long-term weapons-production capacity.

While Zelenskiy boasted earlier this year that Ukraine now produces 60% of what it needs domestically, it still has no large scale production capacity for the most sophisticated missiles and counter measures. Currently, the PAC-3 is the only munition Ukraine has that can reliably bring down Russian ballistic missiles, and Russia has been pouring resources into expanding its missile production capacity.

Kyiv has turned to European production as the only durable solution to its dependence on intermittent US supplies, but the clock is ticking. Ukraine has launched dozens of joint ventures with European defence companies under the so-called Danish model, but these facilities will not start coming on line until 2027 at the earliest and Ukraine’s need for more air defence measures is immediate and urgent.

Zelenskiy raised the licensing issue directly with Trump during their meeting in Washington on July 28. Zelenskiy described the talks as “good”, while Trump said afterwards: “I would like him to end the war. It’s very simple.”

Yet even if Trump were to give formal approval, Ukraine would still face a more fundamental obstacle: Boeing’s reported refusal to licence production of the seeker head used in the PAC-3 interceptor is a potential deal-killer.

The seeker bottleneck

The PAC-3 MSE is the best Patriot interceptor for Ukraine, and its seeker uses Ka-band active electronically scanned array technology, among the most advanced systems of its kind, developed by Boeing.

In reality, even if the Patriot license is granted, Ukraine won’t actually make these missiles, but will be forced to import the components from US producers as it will remain beyond Kyiv’s ability to build the production to make many of the components. The US production bottleneck will remain in effect to begin with as these components are in as high demand as the completed missiles themselves.

That makes Boeing’s seeker a critical bottleneck in any attempt to establish production outside the US.

According to reports, Boeing is not prepared to share the relevant technology with third countries. Without access to the seeker design and manufacturing process, Ukraine cannot build a genuinely domestic PAC-3 supply chain, even if other parts of the missile could be produced locally.

The problem is not limited to intellectual property. Building a complete production network would require licences, specialist factories, qualified suppliers and several years of work.

Even Boeing’s own expansion plans are slow. The company is estimated to need roughly seven years to triple production of the relevant components.

Factories built inside Ukraine would also obviously become priority targets for Russian missile and drone attacks. During this weekend’s missile barrage on Kyiv, the residential damage was widely reported, but less well reported was the strikes on a military industrial complex in Bucha on the outskirts of the capital. As the tit-for-tat missile war continues to escalate, both sides are specifically targeting defence sector factories. That has prompted more discussion of placing at least some production capacity in Western Europe, where it would be less vulnerable but still accessible to Kyiv.

Competing with the US stockpile

Ukraine is seeking 300 missiles, but Washington has used roughly one-third of its pre-war Patriot inventory and around half of its THAAD interceptors since the Iran conflict began.

That would leave the US with an estimated 759-827 Patriot interceptors and 234-278 THAAD interceptors, compared with approximately 2,330 Patriots and 452 THAAD interceptors before the war, the FT reports.

On those estimates, granting Kyiv 300 Patriot missiles would consume a very large share of the remaining American inventory. Secretary of War Pete Hegseth has already cancelled arms deliveries for Ukraine, arguing that the remaining stockpiles have already fallen to below the strategic minimum requirements.

Washington is already trying to reverse the shortage. On March 6 — six days into Operation Epic Fury, the joint US-Israeli campaign against Iran — Trump summoned the chief executives of the seven largest US defence contractors to the White House: Lockheed Martin, RTX (Raytheon's parent), Boeing, Northrop Grumman, BAE Systems, L3Harris and Honeywell Aerospace.

The meeting came as the Pentagon admitted the first four days of strikes had burned through more long-range munitions than four years of fighting in Ukraine, and lawmakers were openly asking whether US missile stockpiles could sustain a prolonged campaign.

Trump characterised the outcome as a win, posting on Truth Social: "We just concluded a very good meeting with the largest US Defence Manufacturing Companies where we discussed Production and Production Schedules. They have agreed to quadruple Production of the 'Exquisite Class' Weaponry in that we want to reach, as rapidly as possible, the highest levels of quantity."

Lockheed Martin's statement struck a similar note, "We are moving with urgency, and we will deliver", as did Northrop Grumman's.

But then they admitted to how long it would take to achieve: a multiyear framework based on agreements with the Pentagon already in place since January. In other words, nothing changed. The production of systems like the Patriot PAC-3 and THAAD interceptors runs at roughly 600-650 units a year, with replenishment timelines industry executives themselves described as measured in years, not weeks or months.

Last week the US Army awarded Lockheed Martin a new contract worth up to $58.6bn to produce PAC-3 MSE interceptors through fiscal year 2032. The agreement expands an earlier one-year, $4.7bn contract into a seven-year procurement programme. Lockheed Martin says it will use the money to triple PAC-3 MSE production capacity by the end of 2030.

That is far too late for Bankova. The start of what is expected to be an intense Russian missile barrage this winter, targeting what is left of Ukraine’s generation capacity is expected to start in a few months; Ukraine started the war with Russia with just under 60GW of installed power capacity but only has 14GW left, according to various estimates. Russia has reportedly already started stockpiling missiles for the campaign.

Finding more air defence ammo has become a problem with no solution. As IntelliNews reported, Europe’s reluctance to sign the defence sector procurement contracts in the early stages of the war has turned into a strategic blunder that will likely cost Ukraine the war. Germany also has a patriot license from the US to make the less-good PAC-2 interceptors, but the first missile is not expected to roll off the conveyer belt of the new factory in Bavaria until 2027.

The most realistic route may be a hybrid arrangement: final assembly or component production in Europe, continued US control over the seeker and other sensitive systems, and long-term purchasing commitments from Ukraine and its allies. But even this model leaves Kyiv dependent on US export approval and American industrial capacity.