Done at Vienna on 23 May 1969. Entered into force on 27 January 1980.
United Nations, Treaty Series, vol. 1155, p. 331
Copyright © United Nations
Vienna Convention on the Law of Treaties
Done at Vienna on 23 May 1969
The States Parties to the present Convention,
Considering the fundamental role of treaties in the history of international relations,
Recognizing the ever-increasing importance of treaties as a source of international law and as a
means of developing peaceful cooperation among nations, whatever their constitutional and social
Noting that the principles of free consent and of good faith and the pacta sunt servanda rule are
Affirming that disputes concerning treaties, like other international disputes, should be settled by
peaceful means and in conformity with the principles of justice and international law,
Recalling the determination of the peoples of the United Nations to establish conditions under
which justice and respect for the obligations arising from treaties can be maintained,
Having in mind the principles of international 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,
Believing that the codification and progressive development of the law of treaties achieved in the
present Convention will promote the purposes of the United Nations set forth in the Charter, namely, the
maintenance of international peace and security, the development of friendly relations and the
achievement of cooperation among nations,
Affirming that the rules of customary international law will continue to govern questions... [continues]
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