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"The obligations of the Covenant in general and article 2 in particular and binding on every State Party as a whole. All branches of government (executive, legislative, judicial), and other public or governmental authorities, at whatever level - national, regional or local - are in a position to engage the responsibility of the State Party. The executive branch that usually represents the State Party internationally, including before the Committee, may not point to the fact that an action incompatible with the provisions of the Covenant was carried out by another branch of government as a means of seeking to relieve the State Party from responsibility for the action and consequent incompatibility. This understanding flows directly from the principle contained in article 27 of the Vienna Convention on the Law of Treaties, according to which a State Party 'may not invoke the provisions of its internal law as justification for its failure to perform a treaty....In this respect, the Committee reminds States Parties with a federal structure of the terms of article 50, according to which the Covenant's provisions 'shall extend to all parts of federal states without any limitations or exceptions."
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