US’s orbital weapons: The limits of global pacts governing space militarisation

Why in the News

The United States has stated that it holds active weapons deployed in space, which is the first such public admission by any country. The US Air Force Secretary described them as “on-orbit space control weapons” capable of defending the joint force against hostile adversary action, and disclosed neither the nature of the weapons nor when they were placed. The admission lands against the Outer Space Treaty of 1967, which bars nuclear weapons and other weapons of mass destruction in space and says nothing about conventional weapons. The contested point is that a capability now acknowledged in public sits entirely outside the only binding instrument that governs the domain.

What is the Outer Space Treaty, 1967?

1. What it bars: It prohibits countries from carrying or placing nuclear weapons or “other kinds of weapons of mass destruction” in space.
2. What it is silent on: It says nothing about conventional weapons, or about weapons designed to strike physical infrastructure in space.
3. Its drafting horizon: It carries no provision on earth to space weapons, because the ability to launch a missile from the ground at a satellite was still some distance away in the 1960s.
4. Its standing: It remains the oldest and still the most relevant international law on the subject, which is why the gaps in it are the gaps in the regime as a whole.

What forms can the use of weapons in space take?

1. Earth to space: A missile launched from the ground destroys a satellite or another space based asset. Ground based systems can also jam or blind the signals of an enemy satellite, and many countries hold that capability.
2. Space to space: One satellite is programmed to crash into another, a co orbital approach the Soviet Union is reported to have tested during the Cold War. Space based assets can also jam or block the communications of an enemy satellite.
3. Space to earth: A satellite based weapon deorbits, enters the atmosphere and strikes a target on the ground. This category has not been demonstrated.
4. Non kinetic effects: A weapon in this domain need not cause physical destruction at all. Disrupting the link between an adversary’s space and ground systems, or attacking its cyber networks, is effective in a conflict without destroying anything.

Which capabilities have actually been demonstrated?

1. Anti satellite tests: Four countries, the United States, Russia, China and India, have destroyed a satellite in orbit with a missile launched from the ground.
2. Tests used own assets: Each of the four targeted its own non functional satellite, which establishes the capability without an act against another state.
3. The Viasat intrusion: Just before the Russian attack on Ukraine in February 2022, Russian hackers took control of the ground stations of the Viasat satellite supplying internet services to Ukrainian subscribers including military agencies.
4. Signal denial: There are reports of Russian attempts to block Global Positioning System (GPS) signals in Ukraine, which is interference with a service rather than destruction of an asset.
5. The newly acknowledged weapons remain undescribed: It is not clear which of these categories the American weapons fall into, since neither their nature nor their deployment date was disclosed.

Why have later attempts at a treaty not closed the gap?

1. The PPWT proposal: Around 2008 China and Russia jointly proposed a Prevention of the Placement of Weapons in Outer Space (PPWT) treaty banning the deployment of all weapons in space and not only weapons of mass destruction. It never came to fruition.
2. It repeated the same omission: The proposal left out earth to space weapons, which is the one category in which a capability has actually been demonstrated.
3. PAROS has produced no instrument: The continuing discussion on the Prevention of an Arms Race in Outer Space (PAROS) at the UN Conference on Disarmament has not produced any law or treaty.
4. The Artemis Accords are voluntary: An initiative of the National Aeronautics and Space Administration (NASA) and the US State Department, they form a voluntary code of conduct on space exploration with over 70 signatory countries including India. Cooperative activities are meant to be peaceful, and nothing in them prevents a signatory from deploying or using weapons in space.
5. The common failure: Every attempt at a binding framework has lacked support from all the major space powers at once, which is the condition such an instrument needs.

How have the other major space powers responded?

1. China’s position: The Chinese foreign ministry urged the United States to stop expanding its military capabilities and preparing for war in outer space.
2. Russia’s position: The Kremlin called for keeping space free of any weapons and for broad international consolidation towards the complete demilitarisation of space.
3. The American counter charge: The US Space Force, set up in 2019, publishes a threat assessment stating that China and Russia are testing and fielding sophisticated counterspace capabilities intended to disrupt and degrade American space enabled capabilities.
4. A symmetric accusation: Each side describes the other’s programme as the threat its own programme answers, which is the pattern that has kept a negotiated instrument out of reach.

Challenges to regulating weapons in space

1. Dual use makes verification impossible: A satellite built to inspect, refuel or remove debris has the same manoeuvring capability as one built to disable another satellite. Eg. Rendezvous and proximity operations are conducted openly as servicing missions by several operators.
   The Fix: Shift the rule from banning objects to regulating behaviour, so a close approach without prior notification becomes the prohibited act rather than the hardware itself.
2. Definition is unsettled: There is no agreed definition of a space weapon, so states negotiate past each other on what a ban would even cover. Eg. Objections to the PPWT proposal turned in part on whether ground based interceptors count.
   The Fix: Negotiate a definition covering effects, including jamming and cyber intrusion, before negotiating the prohibition that is meant to rest on it.
3. Debris outlasts the conflict: A kinetic strike on a satellite creates fragments that endanger every operator in that orbital band for decades. Eg. A 2007 Chinese test created thousands of trackable fragments in low Earth orbit.
   The Fix: Convert the existing voluntary moratorium on destructive testing into a binding commitment, since restraint on testing is separable from restraint on possession.
4. Attribution is slow and contested: A jamming or cyber event against a satellite is hard to trace to a state actor in the time a response would need. Eg. The Viasat ground station intrusion was attributed only weeks after the service outage.
   The Fix: Build a shared incident registry under an existing space body, so interference events are logged and compared rather than disputed one at a time.
5. Commercial assets sit outside state frameworks: Private constellations now carry military traffic while remaining civilian property under national law. Eg. Commercial satellite internet has been used directly by armed forces in an active conflict.
   The Fix: Extend notification and protection obligations to commercial operators whose services are contracted for military use, so their status is settled before a conflict rather than during one.

Conclusion

A capability that was widely assumed has now been stated openly, and the effect of the admission is to make the regulatory silence around it visible. The treaty regime governs a narrow class of weapon and leaves the classes that states actually field untouched, while every attempt to widen it has failed for want of agreement among the powers that would be bound. The thing to watch is whether the discussion at the UN Conference on Disarmament shifts from prohibiting categories of weapon to regulating conduct in orbit, because the first has not moved in nearly two decades.

Back2Basics: UN Conference on Disarmament

1. What it is: It is the single multilateral disarmament negotiating forum of the international community, based in Geneva.
2. Origins: It was established in 1979, succeeding earlier negotiating bodies operating from 1960 onwards, and it reports to the UN General Assembly.
3. How it decides: It works by consensus, so a single member can block the adoption of a negotiating mandate or a text.
4. What it has produced: It negotiated the Chemical Weapons Convention and the Comprehensive Nuclear Test Ban Treaty, and has agreed no new instrument since the latter.

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