40Among those requirements, the obligation to state reasons for decisions adopted by the national authorities is particularly important, since it puts their addressee in a position to defend its rights under the best possible conditions and decide in full knowledge of the circumstances whether it is worthwhile to bring an action against those decisions. It is also necessary in order to enable the courts to review the legality of those decisions (see, to that effect, judgment of 15 October 1987, Heylens and Others, 222/86, EU:C:1987:442, paragraph 15).
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