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Vienna Convention on the Law of Treaties
International agreement / From Wikipedia, the free encyclopedia
The Vienna Convention on the Law of Treaties (VCLT) is an international agreement that regulates treaties among sovereign states.
![]() Vienna Convention on the Law of Treaties
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Signed | 23 May 1969 | |
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Location | Vienna | |
Effective | 27 January 1980 | |
Condition | Ratification by 35 states[1] | |
Signatories | 45 | |
Parties | 116 (as of January 2018)[2] | |
Depositary | UN Secretary-General | |
Languages | Arabic, Chinese, English, French, and Russian[1] | |
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Known as the "treaty on treaties", the VCLT establishes comprehensive, operational guidelines, rules, and procedures for how treaties are drafted, defined, amended, and interpreted.[3] An international treaty is a written agreement between countries subject to international law that stipulates their consent to the creation, alteration, or termination of their rights and obligations, as stipulated in the treaty.[4]
The Vienna Convention on the Law of Treaties was adopted and opened to signature on 23 May 1969,[5][1] became effective on 27 January 1980,[1] and has been ratified by 116 sovereign states as of January 2018.[2] Non-ratifying parties, such as the U.S, have recognized parts of the VCLT as a restatement of customary international law.[6] In treaty law, the VCLT is the authority for resolving disputes about the interpretation of a treaty.[7]