IHL/LOAC

Autonomous Weapons Systems and Proportionality – New Article

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Published a new law review article, “Autonomous Weapons Systems and Proportionality: The Need for Regulation,” in the Case Western Reserve Journal of International Law, Vol. 57:1 (2025). The full text is available for download at SSRN here, and the abstract is below:

This article examines the question of whether International Humanitarian Law (IHL) requires modification to effectively govern autonomous weapons systems (AWS). While extensive scholarly discourse has focused on whether AWS can comply with existing IHL principles, and whether the development and deployment of AWS should be constrained through weapons treaties, insufficient attention has been paid to why and how IHL itself might need adaptation to regulate AWS as a method of warfare. Given that the imminent development and deployment is unlikely to be prohibited, and that AWS may not comply with IHL in certain circumstances, the question of why and how IHL needs to be adjusted is important. The analysis focuses on the principle of proportionality as a means of exploring and illustrating the issue.

The article first traces the evolution of AWS governance debates, highlighting the impasse at the Convention on Certain Conventional Weapons (CCW) regarding constraints on AWS development. It then conducts a detailed examination of the distinct elements and operation of the principle of proportionality, a principle whose implementation demands complex, contextual, and sophisticated judgment.

The article examines the evidence of certain weaknesses of AI-operated AWS, explains why the operationalization of the principle of proportionality would present challenges for such systems, and argues that AWS would likely struggle to implement the principle reliably and predictably in certain operational contexts. The final section supports and defends proposals for the certain adjustments or modifications of IHL to better regulate AWS, thereby ensuring AWS operations remain constrained by the core principles of IHL. It ends by briefly exploring the mechanisms that might be available for developing such constraints.

Discussing Autonomous Weapons Systems and IHL at Case Western Law

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Case Western University School of Law’s annual international law symposium this year focused on the question of whether the Geneva Conventions, enjoying their 75th Anniversary, need to be updated to deal with new challenges, including the application of IHL to space, expanding transnational conflicts with non-state actors, cyber-war, and the development and deployment of fully autonomous weapons systems. The conference began with a closed experts group meeting to discuss the development of a white paper on the issues, followed by an open conference with panels on each of the major topics.

My panel, with Laurie Blank of Emory Univ. Law, Milena Sterio of Cleveland Univ. Law, and Romina Morello of the ICRC, fielded questions from Paul Williams of American Univ. Law, on whether, and how, the Geneva Conventions might need to be updated in some form to better regulate the use of autonomous weapons systems. My article on the subject will be published next year in the Case Western Journal of International Law. Great conference.

JIB/JAB: Episode 39 – Dill and Haque on IHL and the Conduct of the IDF in Gaza

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In this episode I discussed the question of whether it is possible now, while hostilities are still ongoing, to assess whether some aspects of the IDF’s conduct of hostilities may be in violation of IHL, with two of the top experts on the issues: Janina Dill of the University of Oxford and Adil Haque of Rutgers Law School. For more on the episode, including all the supporting reading material, visit the website!

Discussing “Eye in the Sky” from a Legal Perspective – Law and Film!

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In the latest episode of JIB/JAB-The Laws of War Podcast, I have a cross-posted episode in which I am the guest of Jonathan Hafetz on his Law and Film Podcast to discuss the film Eye in the Sky. It is a 2015 film likely known to most JIB/JAB listeners, about a joint British and American drone strike against al-Shabaab terrorists in Kenya, and which intelligently and engagingly explores the legal, ethical, philosophical, political, and strategic issues raised by the operation. We not only examine the film’s treatment of the legal issues implicated, including whether IHL should apply at all, and how the principles of distinction, necessity, proportionality, and precautions in attack are illustrated in the film, but we also explore the relationship between these principles and some of the ethical and strategic aspects of the decision-making in the film. We round out the conversation with a discussion of some other engaging films that similarly explore law in the context of armed conflict. I very much enjoyed the conversation!