The Countermeasures of Others: When Can States Collaborate in the Taking of Countermeasures?

American Journal of International Law

41 Pages Posted: 13 Nov 2023 Last revised: 20 Feb 2024

See all articles by Miles Jackson

Miles Jackson

University of Oxford - Faculty of Law

Federica Paddeu

Queens' College, University of Cambridge

Date Written: October 16, 2023

Abstract

In the last few years, States have put forward policies and proposals for cooperation in the taking of countermeasures in various fields of international law. In this article, we ask whether, and if so under what conditions States, may lawfully collaborate in the taking of countermeasures against another State. We distinguish five different types of collaboration. These are independent but coordinated action; secondment; joint action; aid and assistance; and what we term ‘proxy countermeasures - the idea of taking a measure at the request and on behalf of another State. We consider the permissibility of the collaborating State's actions in two distinct situations: where this State is itself entitled to resort to countermeasures, and where it is not. In relation to the potential evolution of the law, we draw attention to certain legal and policy considerations, as well as plausible avenues for development.

Keywords: Countermeasures, State Responsibility, Erga Omnes obligations, Collective Countermeasures, Cyber-Countermeasures, Third Parties, Complicity, Aid and Assistance, Joint Responsibility

Suggested Citation

Jackson, Miles and Paddeu, Federica, The Countermeasures of Others: When Can States Collaborate in the Taking of Countermeasures? (October 16, 2023). American Journal of International Law, Available at SSRN: https://ssrn.com/abstract=4603233 or http://dx.doi.org/10.2139/ssrn.4603233

Miles Jackson

University of Oxford - Faculty of Law ( email )

Mansfield Road
Oxford, Oxfordshire OX1 4AU
United Kingdom

Federica Paddeu (Contact Author)

Queens' College, University of Cambridge ( email )

Silver Street
Cambridge, CB3 9ET
United Kingdom

HOME PAGE: http://www.law.cam.ac.uk/people/academic/fi-paddeu/2208

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