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Max Planck Encyclopedia of Public International Law [MPEPIL]


Oliver Dörr

From: Oxford Public International Law (http://opil.ouplaw.com). (c) Oxford University Press, 2022. All Rights Reserved.date: 24 May 2022

Customary international law — Unilateral acts — Treaties, reservations and declarations

Published under the auspices of the Max Planck Institute for Comparative Public Law and International Law under the direction of Professor Anne Peters (2021–) and Professor Rüdiger Wolfrum (2004–2020). 

1 Declaration is the means by which subjects of international law express their will, intention, or opinion when acting in the field of international relations. It is generally the form in which unilateral acts of subjects of international law are performed (Unilateral Acts of States in International Law), but it can also be part of a bi- or multilateral transaction, eg if a group of States adopt a common declaration or if a treaty provides for unilateral declarations to be made in order to specify the treaty commitments. If used in a formal sense, the notion...
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