Weaponization of Outer Space

An interview with Prof. Frans von der Dunk

As the US accuses Russia of developing nuclear-armed satellites, what does international law say about weapons of mass destruction (WMD) in outer space? Space law expert, Professor Frans von der Dunk  discusses the weaponization of outer space and the laws that govern weapons beyond the planet. The deployment of weapons of mass destruction in outer space presents not only a significant threat to global security but also a complex challenge to international law, explains Professor von der Dunk, a leading authority on space law at the Nebraska College of Law.

The primary legal framework governing this issue is the Outer Space Treaty of 1967, which was established during the height of the Cold War to ensure that the exploration and use of outer space would be carried out for the benefit of all countries. The treaty expressly prohibits the placement of nuclear weapons or any other types of WMDs in orbit around Earth, on celestial bodies, or in other locations in outer space. This comprehensive ban aims to prevent the outer space from becoming an area of military conflict, von der Dunk notes.

In addition to the Outer Space Treaty, the Partial Test Ban Treaty of 1963 also plays a role by prohibiting nuclear explosions in outer space, further underscoring the global intent to maintain space as a peaceful domain. Despite these legal safeguards, recent developments and accusations suggest that some nations might be exploring technologies that could stretch or violate these boundaries. Historical precedents like the Starfish Prime high-altitude nuclear test by the USA and the accidental crash of the Cosmos 954, a nuclear-powered Soviet satellite, in 1978 highlight the risks and consequences of using nuclear technology in space. 

Professor von der Dunk also highlights the strategic ambiguities and unrestricted areas within the treaties. While the laws clearly ban WMDs, they do not speek to conventional weapons or technologies that could be adapted for military use in outer space. This grey area could lead to future legal and geopolitical challenges as more nations push into earths orbit and beyond. Professor von der Dunk emphasizes that it is crucial that all spacefaring nations work together to enforce these legal norms and consider updates to ensuring that outer space remains a realm for peaceful exploration and cooperation. As space activities intensify, the role of international law becomes ever more critical in safeguarding the final frontier from becoming a battleground. 


  • Attorney CLE accreditation 

Outer Space Treaty (1967)

  • Summary: Establishes the framework for international space law, including the prohibition of placing nuclear weapons or any other weapons of mass destruction in orbit around Earth, on celestial bodies, or in outer space in any manner.

  • Prohibits military activities, such as establishing military bases, testing weapons, and conducting military maneuvers on celestial bodies.

Partial Test Ban Treaty (1963)

  • Summary: Prohibits all test detonations of nuclear weapons except for those conducted underground, thereby preventing nuclear tests in the atmosphere, underwater, and in outer space.

  • Importance in the context of preventing the escalation of arms in space.

Moon Agreement (1979)

  • Summary: Supplements the Outer Space Treaty by specifying that the Moon and its natural resources are the common heritage of mankind, aimed at preventing the Moon from becoming a conflict zone.

  • This agreement explicitly prohibits any country from placing weapons of mass destruction on the Moon or any other celestial body.

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