Vienna Convention on the Law of Treaties
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The Vienna Convention on the Law of Treaties (VCLT) is an international agreement that regulates treaties among sovereign states.
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, Russian and Spanish[1] |
Full text | |
Vienna Convention on the Law of Treaties at Wikisource |
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]