Vienna Convention on the Law of Treaties between States and International Organizations or between International Organizations
Done at Vienna on 21 March 1986
The Parties to the present Convention,
Considering the fundamental role of treaties in the history of international relations,
Recognizing the consensual nature of treaties and their ever-increasing importance as a source of international law,
Noting that the principles of free consent and of good faith and the pacta sunt servanda rule are universally recognized,
Affirming the importance of enhancing the process of codification and progressive development of international law at a universal level,
Believing that the codification and progressive development of the rules relating to treaties between States and international organizations or between international organizations are means of enhancing legal order in international relations and of serving the purposes of the United Nations, Having in mind the principles ofinternational law embodied in the Charter of the United Nations, such as the principles of the equal rights and self-determination of peoples, of the sovereign equality and independence of all States, of non-interference in the domestic affairs of States, of the prohibition of the threat or use of force and of universal respect for, and observance of, human rights and fundamental freedoms for all,
Bearing in mind the provisions of the Vienna Convention on the Law of Treaties of 1969,
Recognizing the relationship between the law of treaties between States and the law of treaties between States and international organizations or between international organizations,
Considering the importance of treaties between States and international organizations or between international organizations as a useful means of developing international relations and ensuring conditions for peaceful cooperation among nations, whatever their constitutional and social systems, Having in mind the specific features of treaties to which international organizations are parties as subjects ofinternational law distinct from States,
Noting that international organizations possess the capacity to conclude treaties, which is necessary for the exercise of their functions and the fulfilment of their purposes,
Recognizing that the practice of international organizations in concluding treaties with States or between themselves should be in accordance with their constituent instruments,
