US missile defense can shoot down nuclear-armed missiles, but only a few at a time. The 44 ground-based interceptors that protect the American homeland are sized to stop a limited strike from a country like North Korea, which fields up to 10 intercontinental ballistic missiles. They are not built to handle the hundreds or thousands of warheads that Russia or China could launch. And in flight tests over roughly two decades, the primary homeland interceptor has hit its target about 57 percent of the time.
The Short Answer, With the Numbers
Homeland defense against ICBMs rests on the Ground-based Midcourse Defense system, with interceptors deployed at Fort Greely, Alaska, and Vandenberg Space Force Base, California. There are 44 of them. Through roughly two decades of flight testing, GMD interceptors have hit their target in about 12 of 20 attempts where the interceptor actually launched against a live target, a success rate near 57 percent.1Missile Defense Agency. Ballistic Missile Defense Intercept Flight Test Record
That number needs context. These are controlled tests against cooperative targets without sophisticated countermeasures, and the system has improved since its early failures. But a 57 percent hit rate means the military plans to fire three or four interceptors at each incoming warhead to reach an acceptable probability of a kill. That math burns through the inventory quickly. Realistically, 44 interceptors can engage perhaps 10 to 15 warheads.
Other pieces of the network perform better against shorter-range threats. The Terminal High Altitude Area Defense system has a perfect record in controlled testing and scored its first real combat intercept in January 2022, when a battery operated by the United Arab Emirates shot down a Houthi ballistic missile over Yemen. The Standard Missile-3 family carried by Navy Aegis destroyers has also compiled a strong test record, and in November 2020 an SM-3 Block IIA destroyed an ICBM-class target for the first time. The Patriot Advanced Capability-3 has been used repeatedly in Middle East combat operations. All of these interceptors use hit-to-kill technology: they destroy the target through direct physical collision at closing speeds of several miles per second, with no explosive warhead.
Why a Full Russian or Chinese Attack Would Overwhelm the System
Russia maintains a military stockpile of roughly 4,400 nuclear warheads, with about 1,800 deployed on strategic delivery systems. China’s arsenal is smaller but growing rapidly. A full-scale Russian attack could involve hundreds of warheads arriving nearly simultaneously. The arithmetic does not work.
Modern ICBMs make it worse. A single Russian or Chinese ICBM can carry multiple independently targetable reentry vehicles, meaning one missile can release several warheads aimed at different cities, plus decoys and other countermeasures designed to confuse the defense. Telling a real warhead from a lightweight decoy in the vacuum of space is one of the hardest unsolved problems in missile defense. In space, objects of very different masses travel at the same speed, so a balloon decoy follows the same trajectory as a half-ton warhead. An attacker can enclose the real warhead inside a balloon identical to the decoys, mask its thermal signature, and deploy dozens of cheap fakes alongside it. The defense either guesses correctly or wastes interceptors on decoys.
This is where most critics of missile defense focus. The system works in controlled tests against single targets with known characteristics, but a sophisticated adversary with countermeasure technology could exhaust the interceptor stockpile with decoys before any real warheads are engaged. The US government has consistently acknowledged this. Official policy frames missile defense as protection against limited strikes from smaller nuclear powers or an accidental launch, not as a shield against Russia or China’s strategic arsenals.
What the System Is Actually Built to Stop
North Korea drives US homeland missile defense investment. The Defense Intelligence Agency assesses that North Korea currently possesses up to 10 ICBMs capable of reaching the entire US mainland. Against a salvo that size, 44 interceptors provide a meaningful defense even at imperfect hit rates, because the military can allocate four or five interceptors per incoming warhead and still keep some margin.
Iran, which does not yet possess an ICBM capable of reaching the US, is a future contingency the system is also sized to address. The guiding principle is that missile defense stays ahead of the threat from these smaller arsenals without pushing Russia or China to build more warheads to overwhelm a larger American defense.
How the Layered Defense Works
A ballistic missile passes through three phases after launch: boost, midcourse, and terminal. Different weapons systems cover each one.
The boost phase begins at launch and lasts while the rocket motor burns. It is extremely short. Even for slower liquid-fueled ICBMs, boost typically finishes within about four minutes, and for solid-fueled missiles the window can be as little as 60 seconds. An interceptor would need to be positioned dangerously close to the launch site to reach the missile in time, which makes boost-phase interception impractical against countries that launch from deep within their own territory.2NAP.edu. Making Sense of Ballistic Missile Defense: An Assessment of Concepts and Systems for U.S. Boost-Phase Missile Defense in Comparison to Other Alternatives No US system currently provides reliable boost-phase intercept capability.
The midcourse phase is the longest, as the warhead coasts through space on a predictable arc. This is where most interception attempts happen. GMD interceptors engage ICBMs here, and Aegis destroyers and land-based Aegis Ashore sites engage shorter-range threats with SM-3 interceptors.
The terminal phase is the last chance, as the warhead re-enters the atmosphere. THAAD intercepts warheads both inside and just outside the atmosphere, while Patriot PAC-3 catches threats at lower altitudes in the final seconds before impact. Terminal systems protect a relatively small area around their deployment site, which limits their usefulness against attacks aimed at multiple locations.
Tying it all together is the Command and Control, Battle Management, and Communications system, which links space-based infrared satellites, ground and sea radars, and interceptor batteries into a single integrated picture so any sensor can cue any shooter.3DTIC. Ballistic Missile Defense Command and Control, Battle Management and Communication (PE 0603896C)
What Happens If an Interceptor Actually Hits a Nuclear Warhead
A common worry is that smashing into a nuclear warhead would set it off. It almost certainly would not. A nuclear detonation requires a precisely symmetrical implosion of the weapon’s fissile core, choreographed by the weapon’s internal triggering system. A kinetic interceptor striking from one direction disrupts that symmetry, and modern nuclear weapons use insensitive explosives specifically designed to resist accidental detonation from external shock or heat. The likely outcome is that the warhead breaks apart without producing nuclear yield, scattering radioactive material as debris.
If the interception happens in midcourse, high in space, the debris follows a short suborbital path lasting roughly 30 minutes or less before falling back toward Earth. Because the fragments travel close to the original trajectory and have relatively low spread velocity, they stay in a compact cloud rather than scattering widely. The small number of fragments that might reach orbital speed are negligible compared to existing space debris and deorbit quickly.
The more dangerous scenario involves a nuclear warhead that somehow detonates at high altitude, whether by deliberate design meant to defeat missile defense or an unlikely accidental partial yield. A nuclear explosion above about 19 miles creates a high-altitude electromagnetic pulse that can damage electronics across a wide area on the ground below. Long cables, power lines, and antennas act as collectors for this energy, potentially damaging large transformers and disrupting communications. Prompt radiation from such a burst would largely be absorbed by the atmosphere before reaching the surface, so the direct radiation danger to people on the ground would be far less than a ground-level detonation. The electromagnetic damage, however, could be severe and long-lasting.
What’s Being Built Next
The current fleet of ground-based interceptors uses aging technology, and the military is racing to replace it. The Next Generation Interceptor is designed to be more reliable, easier to maintain, and capable of handling more complex threats including missiles equipped with multiple warheads. Each NGI would carry multiple kill vehicles, with up to 12 analyzed in environmental planning documents, letting a single interceptor launch engage several objects at once.4Missile Defense Agency. Ground-Based Midcourse Defense Next Generation Interceptor Final Environmental Assessment The Missile Defense Agency estimates initial deliveries by late fiscal year 2027, about a year ahead of the original 2028 schedule.5U.S. Government Accountability Office. Missile Defense: Next Generation Interceptor Program Should Improve Requirements and Oversight Processes
The FY2026 defense budget also plans for a third continental interceptor site beyond Alaska and California, which would expand the number of deployed interceptors and improve coverage. The Missile Defense Agency requested $13.2 billion, with $3.2 billion for the ground-based homeland defense portfolio.6Department of Defense. Fiscal Year 2026 Budget Estimates – Missile Defense Agency
Hypersonic weapons are a different problem. Hypersonic glide vehicles launch on a ballistic trajectory, then detach and glide through the upper atmosphere at speeds above Mach 5, maneuvering unpredictably at altitudes around 25 to 30 miles. That altitude sits in a gap between existing defenses: too low for midcourse interceptors, whose infrared sensors would be blinded by atmospheric heating below about 60 miles, and too fast and high for most terminal systems to handle across a wide area. The only current US capability against a maneuvering hypersonic threat is the SM-6 missile paired with sea-based terminal radar on Navy destroyers.
To close the gap, the Missile Defense Agency is developing the Glide Phase Interceptor with Japan, with Northrop Grumman as prime contractor. The program has faced funding shortfalls and schedule delays. Congress mandated full operational capability by the end of 2032, but earlier funding levels risked pushing delivery to 2035.7U.S. Government Accountability Office. Missile Defense: Better Oversight and Coordination Needed for Counter-Hypersonic Development The FY2026 budget accelerates GPI by two years compared to the previous timeline.6Department of Defense. Fiscal Year 2026 Budget Estimates – Missile Defense Agency
Until those systems arrive, the honest answer to whether the US can shoot down a nuclear missile depends entirely on who launched it and how many. A handful from North Korea, probably. A salvo from Russia, no.