The instruments of acceptance or approval have the same legal effect as ratification and consequently express the consent of a state to be bound by a treaty. It is used instead of ratification when constitutional law (national level) does not require the treaty to be ratified by the head of state.541
541 Arts 2(1)(b), 14(2) and 16 of the 1969 Vienna Convention (adopted 23 May 1969, entered into force 27 January 1980) 1155 UNTS 331 (Vienna Convention).
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