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Part I Conclusion of Treaties, 1 Are Agreements between States and Non-State Entities Rooted in the International Legal Order?

Corten Olivier, Klein Pierre

From: The Law of Treaties Beyond the Vienna Convention

Edited By: Enzo Cannizzaro

From: Oxford Public International Law (http://opil.ouplaw.com). (c) Oxford University Press, 2023. All Rights Reserved.date: 10 December 2023

Use of force, prohibition — Vienna Convention on the Law of Treaties — Peace treaties

Can peace agreements concluded between a State and a non-State entity produce legal effects in the international sphere, as mentioned in Article 3 of the Vienna Convention on the Law of Treaties? Could it be considered that, following the conclusion of such agreements, some areas that were traditionally conceived as pertaining to the national jurisdiction of States (such as the use of violence within national borders, or the choice of a political system) are as of now governed by international law? On the basis of numerous agreements reviewed in this study, a clearly affirmative answer would appear excessive. As far as the international legal effects of such instruments are concerned, much will depend on the specificities of each agreement and on the way it has been implemented. Most of these agreements prove to be rather ambiguous, a significant portion of their components evidencing their rooting in the domestic legal order. This ambiguity finds confirmation in the very pragmatic treatment of peace agreements by the Security Council and States when they call for compliance with these instruments. In the vast majority of cases, such demands are made in the name of the maintenance of international peace and security, without much attention being paid to the characterization in legal terms of the parties' undertakings under these agreements. It therefore appears difficult to reach clear-cut conclusions as to the legal effects of such peace agreements in the international sphere — and, as a consequence, as to their possible characterization as ‘treaties’ under international law.

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