51In those circumstances, an individual relying in legal proceedings on rights which he derives directly from an agreement with a non-member country may not be denied the possibility of challenging the validity of a regulation which, by suspending the trade concessions granted by that agreement, prevents him from relying on it, and of invoking, in order to challenge the validity of the suspending regulation, obligations deriving from rules of customary international law which govern the termination and suspension of treaty relations.
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