132Compliance with that obligation to communicate those grounds is necessary both to enable the persons to whom restrictive measures are addressed to defend their rights in the best possible conditions and to decide, with full knowledge of the relevant facts, whether there is any point in their applying to the European Union Courts (see, to that effect, Case 222/86 Heylens and Others [1987] ECR 4097, paragraph 15) and to put the latter fully in a position in which they may carry out the review of the lawfulness of the European Union measure in question which is their duty under the Treaty (Kadi, cited in paragraph 130 above, paragraph 337).
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