The United States announces the deployment of space weapons: raising concerns about space militarization and power competition

The United States announced that it has deployed a space weapon in Earth orbit, drawing attention to what weapons have been deployed in space and what role they may play in the struggle between major powers to dominate the field.

Washington disclosed little information in the announcement. U.S. Air Force Secretary Troy Meink said the "on-orbit" weapon was necessary to protect U.S. forces from the threat of hostile action, but did not disclose details of the weapon's capabilities or say when it would enter orbit.

So, what could this weapon be? And what is the overall situation of space military development? What other countries might possess similar weapons?

Space has been a militarized domain since the beginning of the space age. As early as the late 1960s, the Soviet Union had deployed weapons in space. Its "Satellite Destroyer" (Istrebitel Sputnikov, IS) program consists of multiple satellites designed to release explosive projectiles that generate large amounts of debris into the flight path of another satellite (usually a US satellite).

Today, advanced military forces deploy satellites in space for a wide range of purposes, including reconnaissance, secure communications, detecting missile launches, and providing positioning information for precision strikes.

As warfare becomes increasingly technological, analysts expect the use of space military hardware to continue to increase.

Dr Bleddyn Bowen, associate researcher in military science at the Royal United Services Institute (RUSI) and associate professor of space politics at Durham University, said he could only speculate on the weapon announced by the United States.

"My expectation is that this may be an electronic warfare or radio jamming platform, a non-destructive anti-satellite weapon," he told BBC Radio 4's Today programme.

He said that such weapons already exist on Earth and can interfere with satellite communications. "If you cut off the radio link, your satellite is almost useless."

Bowen also did not rule out another class of riskier, more destructive weapons that could cause fragmentation and damage.

"The less likely scenario is some kind of kinetic energy kill vehicle, which is a vehicle that can release a projectile to impact and destroy a satellite," he said.

"Satellites with close inspection and capture capabilities are also another possibility," he added.

Whether competitors such as Russia and China have deployed similar weapons in orbit is difficult to tell.

Juliana Suess, a former RUSI researcher and researcher at the German Institute for International Political and Security Affairs (Stiftung Wissenschaft und Politik, SWP), told the BBC: "If you look at China and Russia, both countries have demonstrated related activities."

"For example, in Russia, we have observed some signs that they may be conducting orbital weapons tests. We have seen some situations that seem to indicate that they have launched missiles in orbit as a test."

"There are other examples, but without knowing the specific details on the U.S. side (of this weapon), it's difficult to make comparisons."

However, while such a weapon deployed in orbit may be unusual, the United States, along with its Russian and Chinese adversaries, has long had weapons that can be targeted and launched into space.

In a subsequent interview with the BBC, Bowen downplayed China's criticism of the U.S. announcement. China has warned of the risks of an arms race in space, but Bowen described it as "a mistake made at fifty steps".

"If you're already familiar with this area... you know how hollow these words are from the Russian and Chinese governments," he said.

He added: "The United States, Russia, China and India have all developed different types of anti-satellite or anti-space weapons, and Russia and China have also deployed a large number of technologies with weapons potential in space."

In fact, over the past decade, Russia and China have conducted more space maneuvers known as rendezvous and proximity operations (RPO), which involve flying close to Western satellites.

Dr Rod Thornton, senior lecturer in Russian defense and security studies at King's College, London, told the BBC: "Theoretically, these RPO satellites can become hunter satellites through physical collisions or pushing each other out of orbit."

Bowen added that China has demonstrated "space tug capabilities."

"A vehicle can get close to the satellite, grab it and move it to another orbit," he said.

He said this capability could bring positive benefits, such as clearing space junk, while also disabling functioning satellites.

However, certain types of space weapons can also produce large amounts of space debris.

Dr Mark Hilborne, an expert on space security and weaponization at King's College London, said direct-ascent anti-satellite missile tests - such as one conducted by China in 2007 - would leave a large amount of debris in orbit for an extremely long time.

Seuss said debris from that test is still in orbit and remains dangerous.

"It's not necessarily a giant piece of metal that causes damage. Given the speed of orbit, even a small piece of plastic could cause damage," she said.

nuclear threat

Thornton said that what Russia lacks in the number of space weapons and satellites it makes up for in missile capabilities.

"Russia has missiles that can be launched from the ground into space to attack satellites in low Earth orbit. They also have anti-satellite missiles that can be launched from aircraft at high altitudes," he said.

"From Russia's perspective, NATO has far more satellites than the Russian military can mobilize, so they invest heavily in anti-satellite weapons to 'level the battlefield' to a certain extent."

Thornton also raised an alarming thought: "As a last resort, Russia could also launch nuclear weapons into space, and electromagnetic pulse (EMP) explosions would burn out any satellites that are not protected within a wide range."

So, how likely is it that a nuclear conflict breaks out in space? This is only possible if a nuclear conflict has also occurred on the ground.

"What can happen in space actually doesn't happen in isolation," Bowen said. "It might be that nothing happens, or something might happen."

Since weapons used in space have existed for many years, why did the United States make this announcement now? Experts agree that this is not a major technological breakthrough, but more of a political signal.

Bowen believes that this may be a response to China's development.

He said space warfare would involve "missiles launched into space, maneuverable satellites specifically designed to propel or destroy targets, and ground-based laser weapons."