- Vienna Convention on the Law of Treaties — Treaties, amendments and modification
This chapter explores treaty amendments — an area where the practice regularly departs from the default rules of the 1969 Vienna Convention on the Law of Treaties (VCLT), including procedural mechanisms that affect amendments without requiring each party’s explicit consent. The Convention built on draft articles that the International Law Commission (ILC) submitted to the UN General Assembly in 1966. With some notable exceptions, the VCLT codified the existing customary international law on treaties. The topic of treaty amendment came to be included in the ILC’s draft articles only in 1964. Given the basic principle that a State’s rights under a treaty could not be modified without their consent, amendments were widely seen as raising political and diplomatic, rather than legal, issues.
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