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Article 56 Vienna Convention on the Law of Treaties
Denunciation of or withdrawal from a treaty containing no provision regarding termination, denunciation or withdrawal
1. A treaty which contains no provision regarding its termination and which does not provide for
denunciation or withdrawal is not subject to denunciation or withdrawal unless:
(a) it is established that the parties intended to admit the possibility of denunciation or withdrawal; or
(b) a right of denunciation or withdrawal may be implied by the nature of the treaty.
2. A party shall give not less than twelve months’ notice of its intention to denounce or withdraw from a treaty under paragraph 1.
See also: Article 55 Vienna Convention on the Law of Treaties