Space Weapons: Disclosure Isn’t Enough for Deterrence

On September 14, 2026, Air Force Secretary Troy Meink disclosed that the U.S. Space Force has “on-orbit space control weapons.” He did not specify the type of weapons or their intended operational effects but stated that the disclosure was important from a “deterrence perspective.” Deterrence, however, rests on three components: capability, clearly communicated intent, and a credible threat. Secretary Meink’s disclosure of capability is an important step, but the acknowledgment alone is unlikely to create a deterrent effect. A potential adversary that only knows a space weapon exists has neither sufficient incentive to recalibrate its behavior nor a clear sense of what it should avoid. The United States can close that gap by describing the weapons’ general effects and declaring broad categories of unacceptable behavior, while keeping technical details and specific responses ambiguous. Together, these elements would communicate intent and lay the foundation for a credible deterrent against hostile acts toward U.S. space assets.

For deterrence to work, one side must manipulate the other side’s risk calculus so that the behavior to be deterred (for example, an attack or other hostile action) seems an unattractive option compared to maintaining the status quo. As Thomas Schelling outlines in Arms and Influence, deterrence rests on threatening to impose costs, and that threat must be credible for deterrence to succeed. This can be done through multiple mechanisms, including brinkmanship and clear communication. Clear communication is key, and it requires more than vaguely asserting that a capability exists. The core theory underlying deterrence is that the adversary must have no doubt that retaliation will follow if it crosses a certain threshold. To the aggressor, the perception of retaliation matters more than the defender’s actual military strength. Schelling explicitly argues that deterrence needs more than military capabilities; it “requires projecting intentions.” Clearly articulating intent to retaliate shapes an adversary’s calculations more than the actual odds of victory or the objective costs of attack.

Deterrence takes two forms: general and immediate. The former aims to prevent “unwanted actions over the long term,” while the latter works to avert an act during an active crisis or conflict. Disclosures, like Secretary Meink’s, matter most for general deterrence. Actors use signaling to either “threaten or reassure” others of their intent or resolve. Signaling for deterrence in peacetime is often more effective than in active conflict because it shapes baseline expectations and is less likely to lead to crisis escalation. But general deterrence depends on an adversary internalizing a threshold of what is acceptable behavior, and that threshold cannot be established merely by learning that certain weapons exist and can be employed by the opposite side.

Statements of resolve without clear thresholds are also insufficient. The third chief of space operations, General Douglas Schiess, emphasized that Space Force guardians “stand ready to defend [the domain]” against adversarial threats. However, he did not specify what actions the United States would consider hostile. Under deterrence theory, a commitment like this has limited credibility because it conveys willingness to act without saying what would provoke action. The United States does not need to define every threshold precisely or specify which weapons it would use in response. Instead, declaring broad categories of unacceptable behavior would give adversaries a clear sense of what to avoid while preserving U.S. flexibility in choosing the response.

To develop a successful deterrent posture, acknowledging that a weapon exists is not sufficient. The United States must also signal what that weapon is meant to do. This does not require disclosing technical mechanisms—the weapon’s effects and intent to employ it are sufficient for signaling. The balance between concealing and revealing a capability is a fine line, especially for clandestine capabilities, which lose much or all their value once revealed because an adversary can develop countermeasures against them. Scholars such as James Fearon and Robert Jervis explain that states often have strong incentives to conceal their capabilities, primarily to maintain operational surprise and effectiveness. Political scientists Brendan Rittenhouse Green and Austin Long argue that revealing military capabilities can also have benefits: strengthening general deterrence and diverting adversary resources. But these benefits are only realized if the adversary receives enough information about the capability to adjust its behavior. Acknowledging existence, without any indication of intent or threshold, does not meet the bar.

Signaling does not have to occur through verbal revelations of capabilities; it can also be conducted through campaigning. Joint doctrine defines campaigning as the continuous conduct of military activities to deter adversaries. This can include testing military technologies, increasing investments in next-generation weapons, and conducting joint warfighting exercises to show what the weapons can accomplish. In space, rendezvous and proximity operations (RPOs) and on-orbit satellite maneuvers help demonstrate capability, a component of deterrence. Technology demonstrations, such as the Space Force’s VICTUS HAZE mission, show what could be done as part of a campaign. As part of deliberate campaigning, such activities could advance the U.S. deterrent posture by making capability visible. This visibility would also lend credibility to declared thresholds by signaling that the United States is prepared to act on them.

China and Russia show capability, but do not communicate intentions or thresholds. Both states often frame these demonstrations and tests as “peaceful” or for civilian technology development. For example, Russia has been conducting RPOs in low Earth orbit and geostationary Earth orbit since the 2010s. Other actions exhibited by Russian inspector or “stalker” satellites, such as Cosmos 2558, have led General Stephen Whiting, Commander of U.S. Space Command, to characterize them as “space weapon[s].” Similarly, Chinese satellites have conducted RPOs, which a U.S. general characterized as “dogfighting” in space, as well as on-orbit refueling. China has also demonstrated a capability in which a satellite grappled a defunct satellite and towed it to a graveyard orbit. Their demonstrations reveal what U.S. adversaries can do, but not what would prompt them to act.

Acknowledging that the United States has weapons intended to ensure the joint force can operate without interference is a necessary step in strengthening the U.S. deterrent in space. But as deterrence theory suggests, knowing a weapon exists does not deter on its own. Credibility requires the adversary to know, in general terms, what would cross a line and that retaliation will follow. To deter adversaries in space, capabilities and their effects must be revealed alongside enough information about intent for an adversary to accurately calibrate its risk calculation. The United States does not need to reveal how it would respond, only that it has specific capabilities to impose costs and the will to do so.

Chantal Li is a research assistant with the Aerospace Security Project at the Center for Strategic and International Studies in Washington, D.C.