State-sponsored cyber operations and international law: book review of Henning Lahmann, Unilateral Remedies to Cyber Operations (Cambridge University Press, 2020) and François Delerue, Cyber Operations and International Law (Cambridge University Press, 2020)

Hayashi, Mika, Letrône, William

This is a review of two monographs on cyber operations and international law. Published in 2020, both books discuss state-sponsored cyber operations, legal frameworks with which they could be assessed, as well as legal tools to evaluate the reactions of targeted states. Regarding low-intensity cybersecurity incidents, the two books set up frames of reference very differently. Henning Lahmann’s Unilateral Remedies to Cyber Operations almost exclusively focuses on the principle of non-intervention and sets it up narrowly. François Delerue’s Cyber Operations and International Law proposes applying the same principle under less strict requirements, and also proposes using territorial sovereignty as an independent assessment tool. While the two books go on to examine more or less the same set of legal tools regarding the reactions of targeted states, because of the initial difference, they offer significantly different views on these tools. Nevertheless, the combined reading of the reviewed books confirms the current state of the debate on cyber operations and international law: despite the general acceptance that international law applies to cyber operations, shared understanding to make the law operational is still lacking.

State-sponsored cyber operations and international law: book review of Henning Lahmann, Unilateral Remedies to Cyber Operations (Cambridge University Press, 2020) and François Delerue, Cyber Operations and International Law (Cambridge University Press, 2020)

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