Semiconductors and the Ukraine War: Chips Inside Modern Weapons
A modern guided weapon is, in effect, a flying computer with a warhead. Its seeker, navigation, fuze and fire-control functions all run on semiconductors, which is why chips have become one of the quietest but most decisive chokepoints of the Ukraine war. Two threads run through the story: the West's dependence on a handful of foundries — above all TSMC in Taiwan — for the chips inside its own missiles, and Russia's persistent ability to smuggle Western microelectronics into its weapons despite years of export controls. Both reveal how a tiny, cheap component can shape the battlefield.
Why Weapons Run on Chips
Almost every capability that defines modern combat power depends on semiconductors: precision guidance, radar, electro-optical seekers, secure communications, satellite navigation and nuclear command-and-control. A Patriot interceptor, a GMLRS rocket, a Javelin missile or a Shahed-style attack drone are all built around microprocessors, memory, signal-processing chips and radio-frequency components. Remove the silicon and the weapon is inert.
The scale of this dependence is striking. The U.S. Air Force has estimated that roughly 90% of its precision-guided munitions rely on chips manufactured by TSMC. That single statistic captures why semiconductors are now treated as a strategic material on par with steel or explosives — and why both Ukraine and Russia have made chip supply chains a target of intelligence, procurement and sabotage efforts.
The war has also been a live demonstration of attrition economics. When missiles are fired by the thousand, the constraint shifts from designing the weapon to manufacturing enough of its components at scale. Chips sit at the heart of that constraint.
Legacy Nodes, FPGAs and RF
A common misconception is that weapons use the most advanced chips. In reality, most munitions and many platforms rely on legacy or trailing-edge nodes — mature process technologies that are rugged, radiation-tolerant, qualified over decades and cheap to produce. These older designs are reliable, but the commercial semiconductor industry has largely moved on, so they must often be made in small, dedicated batches, creating obsolescence and single-source risk.
Field-programmable gate arrays (FPGAs) are a particularly important category. They are reconfigurable chips that can be tailored to many functions, which makes them ideal for radar, signal processing and avionics where requirements evolve over a platform's life. The F-35 fighter alone uses hundreds of chips, including numerous FPGAs. The leading FPGA designers — AMD (Xilinx) and Microchip — are U.S. firms, but most of their wafers are fabricated by TSMC and UMC in Taiwan.
Radio-frequency and analog parts round out the picture. Seekers, jammers, datalinks and electronic-warfare systems depend on specialized RF and mixed-signal devices, many of which also originate from a narrow set of fabs. The diversity of chip types in a single weapon is exactly what makes the supply chain hard to secure or to fully reshore.
Foundries and the Taiwan Risk
Most of the world's advanced and many specialty chips are fabricated by a small number of foundries. TSMC of Taiwan dominates leading-edge logic, with UMC also significant; Samsung is a distant third. In the United States, GlobalFoundries is the only commercial high-volume foundry holding full Trusted Foundry status, and it has secured CHIPS Act support and a multi-year supply agreement with the Department of Defense reported at around $3.1 billion.
This concentration creates a stark vulnerability. Because so many guided-weapon and avionics chips ultimately trace back to Taiwan, a blockade or conflict that halted Taiwanese output would disrupt not just consumer electronics but the production and sustainment of Western missiles, aircraft and sensors. Analysts at CSIS and ORF America have repeatedly flagged this dependence as a national-security liability that cannot be fixed quickly.
The Ukraine war has sharpened the point. As Western governments race to rebuild depleted stockpiles of Patriot, AMRAAM and GMLRS rounds, every additional weapon needs its full complement of chips — and those chips compete with civilian demand for the same scarce fab capacity.
Russia's Sanctions Evasion
The mirror image of Western dependence is Russian dependence on Western technology. Investigators teardown Russian weapons recovered in Ukraine have repeatedly found that they are stuffed with foreign microelectronics. The KSE Institute at the Kyiv School of Economics analyzed dozens of captured systems and identified more than 1,000 foreign components, overwhelmingly Western-designed semiconductors, inside missiles, drones, radios and armored vehicles.
Russia obtains these parts by rerouting imports through third countries. New supply chains run through China, NATO member Turkey, Kazakhstan and the United Arab Emirates, where nominally civilian electronics are purchased and then redirected into the military supply chain. According to KSE estimates, in the first ten months of 2023 Russia imported roughly $8.7 billion in high-priority semiconductors and communications gear produced largely for military use, alongside about $22.2 billion in dual-use electronics.
Enforcement is genuinely difficult. Chips are small, cheap, fungible and embedded in countless civilian products, so a single legitimate distributor can resell to a shell company abroad with little visibility. As RFE/RL has reported, U.S. semiconductor firms that outsourced production struggle to trace where their parts ultimately end up — making chip controls far harder to enforce than embargoes on large, easily tracked equipment.
The CHIPS Act Response
The U.S. CHIPS and Science Act is the headline Western response to foundry concentration. It channels tens of billions of dollars into domestic semiconductor manufacturing and research, underpinning new or expanded fabs from Intel, TSMC and Samsung on American soil. GlobalFoundries received roughly $1.575 billion in CHIPS Act funding to expand specialty and legacy production that defense systems depend on.
For the military the goal is twofold: reduce reliance on Taiwan for leading-edge logic, and rebuild secure, trusted capacity for the older and specialty nodes that munitions actually use. Reshoring leading-edge fabs grabs headlines, but the harder problem is sustaining low-volume, long-life legacy lines that are commercially unattractive yet militarily essential.
None of this is a quick fix. Fabs take years to build and qualify, and the defense share of total chip demand is small, so commercial incentives alone will not preserve every needed node. The Ukraine war has nonetheless turned an abstract supply-chain debate into an urgent industrial-policy priority on both sides of the Atlantic.
Key Data
| Metric | Value (as-of) |
|---|---|
| USAF precision-guided munitions relying on TSMC chips | ~90% (USAF estimate) |
| Russia high-priority chip/comms imports, Jan-Oct 2023 | ~$8.7B (KSE Institute) |
| Russia dual-use electronics imports, Jan-Oct 2023 | ~$22.2B (KSE Institute) |
| Foreign components found in captured Russian systems | 1,000+ across dozens of systems (KSE) |
| GlobalFoundries CHIPS Act funding | ~$1.575B (2024) |
| GlobalFoundries DoD supply agreement (reported) | ~$3.1B (reported) |
⚠ Figures are approximate and tied to as-of dates from 2023-2025. Verify against KSE Institute, CSIS and RFE/RL reporting. Not investment advice.
Frequently Asked Questions
Why do modern weapons depend on semiconductors?
Precision guidance, radar, seekers, secure radios, navigation and fire control all run on chips. A guided missile is essentially a flying computer with a warhead, so without microprocessors, FPGAs and RF components it cannot find or hit its target. The U.S. Air Force has estimated that around 90% of its precision-guided munitions rely on chips made by TSMC.
Do weapons use the most advanced chips?
Mostly no. Most munitions and many platforms use legacy or trailing-edge nodes that are rugged, radiation-tolerant and long-lived, not the cutting-edge sub-5nm logic used in phones. The challenge is that these older chips are made in small, dedicated batches and the commercial industry has moved on, which creates obsolescence and supply risk.
Which foundries make defense chips?
Advanced and many specialty parts are fabricated by TSMC in Taiwan, with UMC also significant. In the United States, GlobalFoundries is the only commercial high-volume foundry holding full Trusted Foundry status and has a multi-year supply agreement with the Department of Defense. FPGA designers such as AMD/Xilinx and Microchip rely heavily on these foundries.
What are FPGAs and why do they matter for weapons?
Field-programmable gate arrays are reconfigurable chips that can be tailored to many functions, which makes them ideal for radar, signal processing and avionics where designs evolve. The F-35, for example, uses hundreds of chips including FPGAs. Most FPGA wafers are fabricated by TSMC and UMC, so a Taiwan disruption would ripple into defense electronics.
How does Russia get Western chips for its missiles despite sanctions?
Investigators have recovered hundreds of Western-made components from Russian weapons in Ukraine. Russia reroutes imports through third countries such as China, Turkey, Kazakhstan and the United Arab Emirates, buying nominally civilian electronics that are then fitted into missiles, drones and radios. The KSE Institute documented more than 1,000 foreign components across dozens of captured systems.
How much restricted technology does Russia still import?
According to KSE Institute analysis, in the first ten months of 2023 Russia imported roughly $8.7 billion in high-priority semiconductors and communications technology produced largely for military use, plus about $22.2 billion in dual-use electronics and components. Enforcement is difficult because the chips are tiny, cheap and shipped through long chains of intermediaries.
Why is it so hard to stop chip smuggling into Russia?
Microchips are small, fungible and ubiquitous in civilian goods, so a single legitimate distributor can resell to a shell company abroad with little visibility. U.S. semiconductor firms that outsourced production struggle to trace where parts ultimately go. Closing every node in a global distribution chain is far harder than blocking large, easily tracked items.
What is the CHIPS Act and how does it relate to defense?
The U.S. CHIPS and Science Act directs tens of billions of dollars into domestic semiconductor manufacturing and R&D, supporting new or expanded fabs from Intel, TSMC and Samsung. For defense it matters because it aims to reduce reliance on Taiwan and rebuild secure, trusted U.S. capacity, including specialty and legacy production that military systems depend on.
Would a Taiwan crisis threaten Western weapons production?
Yes, significantly. Because so many guided-weapon and avionics chips trace back to TSMC and UMC in Taiwan, a blockade or conflict that halted Taiwanese output would disrupt the production and sustainment of Western missiles, aircraft and electronics. This concentration risk is a central reason for the CHIPS Act and allied reshoring efforts.
Where can I verify these semiconductor figures?
Primary sources include the KSE Institute and RUSI reports on Russian component sourcing, CSIS and ORF America analyses of defense chip dependence, and U.S. government statements on the CHIPS Act and Trusted Foundry program. Figures such as import totals are as-of dates from 2023-2025 and should be checked against the latest releases. This page is analysis, not investment advice.