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Max Planck Encyclopedia of International Procedural Law [MPEiPro]

Horizontal Complementarity

Cedric Ryngaert

From: Oxford Public International Law (http://opil.ouplaw.com). (c) Oxford University Press, 2023. All Rights Reserved.date: 16 July 2024

Aut dedere aut judicare — Complementarity — International cooperation, procedure — Ne bis in idem — Judicial cooperation — Jurisdiction — Relationship between international and domestic law — Jurisdiction of states, universality principle

Published under the direction of Hélène Ruiz Fabri, with the support of the Department of International Law and Dispute Resolution, under the auspices of the Max Planck Institute Luxembourg for Procedural Law.

1 This contribution is partially based on CMJ Ryngaert ‘Horizontal Complementarity’ in C Stahn and MM El-Zeidy (eds), The International Criminal Court and Complementarity — From Theory to Practice (CUP Cambridge 2011) 855–87. 2 The principle of universal jurisdiction confers on bystander states, ie states that do not have a strong territorial, personal, or security connection with a crime situation, the authority to prosecute a limited number of international crimes, such as war crimes, crimes against humanity, and genocide, on the basis of treaty (Treaties) and...
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