Vienna Convention on the law of treaties between States andinternational organizations or between international organizations


The Vienna Convention on the Law of Treaties between States and International Organizations or between International Organizations (commonly referred to as the Vienna Convention on the Law of Treaties between States and IOs) is an international treaty that governs the formation, interpretation, and termination of treaties between states and international organizations or between international organizations themselves.

The Vienna Convention was adopted on March 21, 1986, and entered into force on January 27, 1988. It was established under the auspices of the United Nations and is considered a cornerstone of international treaty law. The convention consists of 38 articles that outline the rights and obligations of states and international organizations with regards to treaty-making.

The main objectives of the Vienna Convention are to promote the peaceful coexistence of states and international organizations and to provide a framework for the development of international law. It sets out general principles and rules that guide the negotiation, interpretation, and implementation of treaties. Some of the key provisions of the convention include:

  1. Definition of a treaty: The convention defines a treaty as an international agreement concluded between states or international organizations and governed by international law, regardless of its particular designation.
  2. Consent to be bound: It establishes the principle that the consent of the parties to be bound by a treaty must be expressed in writing and is binding upon them.
  3. Entry into force and application of treaties: The convention sets out the conditions for the entry into force of treaties and the rules regarding their application over time.
  4. Interpretation of treaties: It provides guidelines for the interpretation of treaty provisions, taking into account the ordinary meaning of the terms, the context, and the object and purpose of the treaty.
  5. Invalidity and termination of treaties: The convention outlines the circumstances under which a treaty may be considered invalid or terminated and the legal consequences of such actions.
  6. Reservations to treaties: It regulates the practice of making reservations to treaties, which are unilateral statements made by states or international organizations regarding their intended modifications or exclusions from treaty provisions.

The Vienna Convention on the Law of Treaties between States and IOs has been ratified by a significant number of states and international organizations, making it one of the most widely accepted international legal instruments. It provides a framework for the negotiation and implementation of treaties, ensuring legal certainty and promoting the peaceful resolution of disputes among parties.

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