ASAT Weapons

What it is

Anti-satellite (ASAT) weapons are systems designed to destroy, disable, or degrade satellites in orbit. They fall into four categories: direct-ascent kinetic kill (a ground- or air-launched missile strikes the target), co-orbital (an interceptor satellite maneuvers to rendezvous with and attack a target), directed energy (lasers, high-power microwave, or nuclear EMP), and electronic warfare (jamming uplink or downlink signals, spoofing navigation data). As of mid-2026, four states have demonstrated destructive kinetic ASAT capability: the United States, China, Russia, and India. A wider circle, including the UK, France, and Australia, operates electronic-warfare and cyber counterspace systems without having conducted live kinetic tests. Satellites underpin GPS navigation, missile warning, broadband, and financial timing, so an ASAT strike carries consequences well beyond the battlefield.

History

Cold War development ran in parallel on both sides: the US deployed a nuclear-armed Thor missile base in the Pacific (Program 437, retired 1975) and fielded the F-15-launched ASM-135 kinetic missile, using it in September 1985 to destroy the Solwind P78-1 solar observatory at 555 km. The Soviet Union developed a co-orbital interceptor (the IS program, tested from 1968 onward) that could maneuver alongside a target satellite and detonate.

After a post-Cold-War pause, China conducted a direct-ascent ASAT test in January 2007 against its own Fengyun-1C weather satellite at 865 km altitude, generating more than 3,000 trackable fragments, the largest debris-producing event on record. India destroyed its own Microsat-R satellite at roughly 300 km in March 2019 (Mission Shakti), becoming the fourth state to achieve a live kinetic intercept. Russia destroyed its defunct Cosmos-1408 satellite at 480 km in November 2021 using the Nudol (PL-19) direct-ascent interceptor, producing more than 1,500 trackable pieces and forcing the International Space Station crew to shelter in docked capsules.

Current state

As of mid-2026, all four states retain demonstrable destructive ASAT capability. Russia's Nudol system was tested roughly ten times since 2015 before the 2021 live kill; day-to-day Russian counterspace activity relies more on electronic jamming and spoofing. China has not conducted a live kinetic test since 2007 but continues developing co-orbital systems: the SJ-21 satellite demonstrated rendezvous-and-docking in 2022, directly transferable to an intercept mission. The US Space Force is fielding electronic satellite jammers as an offensive counterspace measure.

In April 2022, the US became the first state to declare a unilateral moratorium on destructive direct-ascent ASAT testing and called on others to follow. As of mid-2026, 35-plus states have endorsed the moratorium; China and Russia have not.

A separate concern is Russia's alleged nuclear ASAT system. US intelligence agencies and the Secure World Foundation assess that COSMOS-2553, launched in February 2022 into an orbit at roughly 2,100 km (a region otherwise unoccupied), is a probable testbed for a nuclear payload. A detonation at that altitude would generate EMP and trapped radiation belts capable of disabling satellites across multiple orbital shells for months to years. The system has not been deployed or tested. Doing so would violate Article IV of the 1967 Outer Space Treaty, which prohibits placing nuclear weapons in orbit. A December 2024 UN General Assembly resolution calling for compliance with the Outer Space Treaty passed with 167 votes.

Relationships

The ASAT problem sits at the centre of the broader counterspace arms race, where electronic warfare, cyber attacks, and laser dazzling are already in routine operational use by multiple powers and where kinetic tests serve as capability signals to adversaries. ASAT tests directly feed the orbital debris crisis: the 2007 Chinese test and 2021 Russian test together account for the bulk of the high-altitude debris population that now threatens functioning satellites. Disabling GPS or missile-warning satellites would in turn cascade into navigation and PNT vulnerabilities far beyond the battlefield.

What to watch

• Whether China or Russia conduct a new destructive kinetic ASAT test, or whether China demonstrates an operational co-orbital intercept.
• Any confirmed test or deployment of Russia's alleged nuclear ASAT payload, using COSMOS-2553 or a successor testbed.
• Whether the 35-plus-state moratorium expands into a multilateral treaty with verification mechanisms, or stalls without Chinese and Russian participation.
• Whether US offensive counterspace fielding lowers the threshold for active counterspace use in a future crisis over Taiwan or Ukraine.