The Next Battlefield Has No Rulebook: Why the World Needs a Real Law of War for Space

On February 5, 2016, an Atlas V rocket lifted off from Cape Canaveral carrying a GPS satellite, USA-266, into a semi-synchronous orbit nearly 20,000 kilometres above the earth. It was routine. Eight years later, it is still up there, still working, still one of only about thirty satellites on which the entire American GPS constellation depends. Every bank transfer timestamp, every harvester guided by satellite, every phone that tells you which street you're on, ultimately traces back to a small number of these machines, hanging in the sky with no cover, no armour, and — for the most part — no legal protection whatsoever.

That last part is the problem.

Space has quietly become the most contested piece of real estate on, or rather above, the planet. Over the last five years it has hosted a direct-ascent missile strike, a cyberattack that blinded an army mid- invasion, and — in 2023, over Eilat — the first interception in history to occur outside the atmosphere. Three major powers now openly develop weapons designed to disable or destroy satellites. And the treaty meant to govern all of it was written in 1967, runs to a few short articles, and never anticipated any of this.

What follows makes the case for closing that gap in plain terms: what has already happened, why orbit is valuable enough to fight over in the first place, why almost nothing up there can defend itself, how thin the existing law actually is once you read past its headline promises, and what a workable fix would need to contain. None of it requires imagining a future war. Every example in this essay has already occurred.

This is an argument for treating the regulation of conflict in orbit with the same seriousness the world eventually gave nuclear weapons

— before a single incident turns a shared resource into a wasteland.

A Decade of Firsts

Start with what has actually happened, because none of it is hypothetical anymore.

In November 2021, Russia launched a missile from Plesetsk Cosmodrome and destroyed one of its own defunct satellites, scattering more than 1,500 pieces of trackable debris across low earth orbit. It was the fourth country to demonstrate this capability, after the US and, in a 2007 test with far worse debris consequences, China. The International Space Station's crew had to shelter in their return capsules as the debris cloud passed.

Four months before Russian tanks crossed into Ukraine in February 2022, hackers linked to the Russian state had already opened a second front — in orbit. Using stolen credentials, they pushed malware onto the modems of Viasat, the satellite internet provider the Ukrainian military relied on for battlefield communication, disabling the network across Europe in the process. It remains one of the most consequential cyberattacks ever carried out against space infrastructure, and it landed an hour before the invasion began.

Then, in 2023, came a moment historians of warfare may mark as a genuine turning point: Israel's Arrow 3 system intercepted a Houthi ballistic missile more than 160 kilometres above the earth's surface — inside space, by most technical definitions of where the atmosphere ends. For the first time, a physical act of war took place off-planet.

None of these events triggered a binding legal response, because none of them clearly violated binding law. That is not an accident. It is a design flaw in the only treaty that exists, and the rest of this essay is spent explaining exactly how that flaw came to be and what closing it would actually require.

Why Orbit Is Worth Fighting Over

It helps to be honest about why any of this is happening: orbit is simply one of the most valuable pieces of infrastructure humanity has ever gained access to, and almost none of that value is evenly distributed or easily replaced.

A satellite parked in geostationary orbit — roughly 35,800 kilometres up, moving at the same rotational speed as the earth — appears fixed in the sky from the ground. That single property built entire industries: satellite television, weather forecasting for national meteorological agencies, and decades of military communications planning, all resting on the fact that a dish pointed at one spot in the sky never has to move again. Lower down, in what's now called low earth orbit, proximity to the ground cuts the round-trip signal delay from over half a second to a few dozen milliseconds — the difference that made SpaceX's Starlink viable as a genuine broadband competitor, launching thousands of small, cheap satellites instead of a handful of expensive ones.

Militaries look at exactly the same map and see exactly the same value, sharpened. A vantage point that can broadcast a TV signal can also relay an encrypted order to troops in the field. A satellite that forecasts a hurricane can also track an adversary's naval movements. A constellation that syncs global banking can also guide a missile to a target with metre-level precision. There is no meaningful line between the civilian and military uses of orbit — which is precisely why an attack on “infrastructure” in space is never really just an attack on infrastructure, and why treating the two as separable in law has never quite worked.

Layered on top of this is a peculiarity found almost nowhere else in modern geopolitics: near-total secrecy conducted in plain sight. Every satellite in orbit can be tracked by anyone with the right optics — its exact location is public knowledge. What it does, and who it belongs to, very often is not. Roughly half of recent U.S. military satellite launches have gone up with no disclosed purpose at all. In 2022, amateur satellite trackers famously identified four secret Department of Defense satellites hidden aboard what was billed as a routine commercial launch, using nothing more than public livestream footage and orbital mechanics. Every major space power runs assets like this. The public knows precisely where the pieces are on the board and almost nothing about what they're for — which makes verifying any future rule about conduct in orbit a genuinely strange legal problem: location is never in dispute, but intent almost always is.

Sitting Ducks With No Rulebook

Here is the part that should worry policymakers most: everything valuable in orbit is also, by the nature of physics, nearly indefensible.

There is no terrain in space. No mountain range to fortify, no ocean to patrol, no weather to hide behind. A satellite's location is knowable to the metre, its trajectory predictable to the second, and its structure — optimised ruthlessly for weight — offers essentially no protection against attack. Destroying one requires only the ability to get a projectile, a laser, or a piece of malware to the right point in space at the right time. All three global space powers — the United States, Russia, and China — have already demonstrated they can do at least the first of these.

The offensive toolkit has expanded well past blunt kinetic strikes. China's Shijian series of satellites carry robotic arms that American defence assessments say could double as grappling weapons. Russia's Kosmos 2542 satellite released a sub-satellite that itself fired a high-speed projectile in 2020 — widely interpreted internationally as a weapons test, though it struck nothing. The United States has quietly shown it can manoeuvre satellites to shadow other nations' spacecraft at close range in geostationary orbit, a capability that reads very differently depending on whether one calls it “surveillance” or “positioning for a first strike.” And hanging over all of it is the unresolved question of a Russian anti- satellite weapon with a nuclear component — first flagged publicly by U.S. officials in 2024, still unconfirmed as operational, and serious enough that U.S. Space Command ran a dedicated war-game on the scenario in early 2026.

A nuclear detonation in orbit would not discriminate between military and civilian satellites, allied and adversary hardware, or

even the nation that set it off.

It would degrade nearly everything in the affected orbital band for months or years through radiation alone. It is also almost certainly illegal — the 1967 Outer Space Treaty bars placing weapons of mass destruction in orbit, and a separate 1963 treaty bans nuclear detonations in space entirely. But “almost certainly illegal” has not, historically, been enough to stop anyone building the thing in the first place.

Every one of these tests and near-tests generates debris, and debris is where the real long-term threat lives. Objects at higher altitudes can take over a century to fall back to earth and burn up; above roughly 700 kilometres, anything created today will still be in orbit when everyone reading this is gone. By mid- 2026, the European Space Agency estimated well over 100 million trackable and untrackable fragments circling the planet, and conjunction warnings — the close-call alerts satellite operators now live with daily — have risen five-to-tenfold in the busiest low-earth-orbit bands over the past decade. This is the mechanism behind what's known as Kessler Syndrome: the theoretical point at which debris density becomes self-sustaining, each collision spawning enough fragments to guarantee the next one, until an entire altitude band becomes unusable for a generation. Nobody has to intend a Kessler cascade for one to start. A single reckless test can be enough, and unlike almost every other consequence of war, it cannot be aimed — debris does not check the flag on the satellite it hits next.

A Treaty Written for a Different Era

All of this sits on top of a legal foundation that simply was not built for it.

The Outer Space Treaty of 1967 is a product of its moment: two superpowers, a handful of active spacefaring nations, and a shared fear that the moon might become the next Cold War flashpoint. Its core prohibition — Article IV — bans nuclear weapons and weapons of mass destruction in orbit, and bans military bases on the moon or other celestial bodies. That is essentially the whole of it. It says nothing about conventional anti-satellite weapons, nothing about cyberattacks on space infrastructure, nothing about debris-generating tests, and nothing about the robotic-arm satellites, co- orbital shadowing, or projectile-launching sub-satellites that now make up most of the actual arms race. A treaty this narrow was survivable only as long as the United States and its allies held something close to a monopoly on meaningful access to space. That monopoly no longer exists.

The one real diplomatic advance since then has been narrow and voluntary. In 2022, after the Russian debris-generating test, the U.S. announced a unilateral moratorium on destructive direct-ascent anti- satellite testing and took the idea to the UN General Assembly, which passed a resolution endorsing it that December by a vote of 155 to 9. It was a genuine diplomatic win — and, by design, a toothless one. It is a non-binding resolution, not a treaty. It covers only one specific method of attack and says nothing about lasers, jamming, cyberattacks, robotic arms, or co-orbital weapons. And critically, the three countries besides the U.S. that have actually demonstrated destructive anti-satellite capability — Russia, China, and India — all declined to join. Only around three dozen nations, mostly U.S. allies with no offensive space programs of their own, have signed on. The states doing the arming were never going to be bound by a pledge with no enforcement mechanism, and they have not been.

There is, at least, movement on the civilian side. The European Union has spent since mid-2025 negotiating a binding EU Space Act aimed at mandatory debris-mitigation standards, sustainability requirements, and safety certification for anyone operating in or selling into European orbit — a serious attempt at regulation, though currently not expected to take effect before 2030, and focused on sustainability and market safety rather than the conduct of war. The U.S. Department of Defense, for its part, has effectively given up trying to protect any individual satellite and pivoted instead toward what it calls “architecture resilience” — building constellations, like the Proliferated Warfighter Space Architecture, so large and cheap per unit (roughly $15 million a satellite, versus over $100 million for older-generation military hardware) that no single attack could meaningfully cripple them. That is a sound engineering response to an unregulated environment. It is not a substitute for regulating the environment.

The Case for Acting Now

The nuclear-weapons comparison that keeps surfacing in this debate is not just a rhetorical flourish — it is structurally accurate, and it points to the exact problem international law needs to solve.

With nuclear weapons, the technology itself could eventually be restricted: enrichment facilities, delivery systems, and fissile material are all identifiable, trackable, and — imperfectly — controllable. Anti-satellite capability offers no equivalent chokepoint. Nearly any missile capable of reaching orbit can be repurposed as a kinetic anti-satellite weapon; nearly any satellite with a manoeuvring thruster can be repurposed as a co-orbital one. One cannot ban the hardware without banning space access itself. The only thing left to regulate is conduct — and conduct is exactly what the current framework fails to touch.

That argues for a specific, achievable target rather than a grand rewrite of space law: a binding instrument, negotiated through the UN's Committee on the Peaceful Uses of Outer Space or a comparable body, that does three things the current regime does not.

First, it should convert the 2022 anti-satellite moratorium from a voluntary pledge into an enforceable prohibition covering all destructive testing methods, not just direct-ascent missiles, with a verification regime built around tracking capability that already exists — every major power can already see exactly where every satellite is, which makes attribution far easier here than it ever was in nuclear or chemical weapons verification, even if intent will always be harder to pin down than location.

Second, it should establish a liability and debris-mitigation standard with real teeth, extending the logic the EU is currently building unilaterally into something the major spacefaring states are actually bound by, rather than something only the already-cooperative sign up for.

Third, and most urgently, it should close Article IV's silence on conventional weapons by explicitly extending the ban on space-based weapons beyond weapons of mass destruction to cover any weapon designed to destroy or permanently disable an object in orbit — while carving out the surveillance, communications, and rendezvous-and-proximity satellites that keep the current uneasy peace stable.

None of this is naive. Major powers will resist binding limits on capabilities they have spent billions developing, exactly as they have resisted equivalent limits on cyberweapons and hypersonics. But the alternative is not stability — it is a slow-motion tragedy of the commons in which every nation has an incentive to arm because every other nation is arming, and where the eventual cost of getting it wrong is not a battlefield but an orbital band rendered unusable for a century. Nuclear deterrence worked, when it worked, because mutually assured destruction was matched by decades of arms-control architecture that gave adversaries a way to step back from the edge without losing face. Space currently has the mutual destruction part figured out. It has none of the architecture.

Conclusion

Put the pieces back together and the shape of the problem is simple, even if the politics are not. Orbit is now indispensable to civilian life and to modern warfare in equal measure. Nothing placed there can defend itself. Three states have shown they can strike at will, a fourth capability with genuinely catastrophic potential is unconfirmed but taken seriously enough to be war-gamed, and the one treaty meant to prevent exactly this outcome was written for a world with two spacefaring powers and no conception of a robotic arm doubling as a weapon.

The fixes on the table are not radical. Turning a voluntary testing moratorium into a binding one does not require new technology, only new political will — the tracking infrastructure to verify compliance already exists. Extending debris liability rules already being built in Europe to the states actually generating most of the debris is a matter of negotiation, not invention. And closing a two-paragraph gap in a fifty-year-old treaty to cover conventional weapons is, by the standards of international law, a modest amendment.

What is missing is not the technical or legal blueprint. It is the sense of urgency that usually only arrives after the damage is done — after a Cuban Missile Crisis, after a Chernobyl, after the event that makes “almost” suddenly feel unbearably close. Space has already handed the world several previews of what that event could look like: an ISS crew forced into their return capsules, a battlefield blinded on the eve of an invasion, a war-game convened specifically to rehearse a nuclear detonation in orbit. Previews are, by definition, not the real thing. The argument of this essay is that the world should not need to sit through the real thing before it finally writes the rules.

Sources Consulted

● UN General Assembly, Resolution A/RES/77/41 on destructive direct-ascent anti-satellite missile testing (2022), and UN press coverage of the vote

● Outer Space Treaty of 1967, Article IV

● Secure World Foundation — reports on the DA-ASAT moratorium and Russia's alleged nuclear anti-satellite weapon

● Lieber Institute, West Point — legal analysis of Russia's alleged nuclear ASAT capability under the Outer Space Treaty

● Defense One and Forbes reporting on U.S. Space Command's 2026 nuclear-ASAT war game ● European Commission / U.S. Office of Space Commerce — updates on EU Space Act negotiations, 2025–2026 ● Aerospace America and the Bulletin of the Atomic Scientists — reporting on Kessler Syndrome and current orbital debris estimates, 2025–2026

● Reporting on the 2022 Viasat/AcidRain cyberattack and the 2023 Arrow 3 interception near Eilat