146The scope of the requirements relating to the maintenance of law and order or national security cannot therefore be determined unilaterally by each Member State, without any control by the institutions of the European Union (see, to that effect, judgments of 11 June 2015, Zh. and O., C‑554/13, EU:C:2015:377, paragraph 48, and of 2 May 2018, K. and H.F. (Right of residence and alleged war crimes), C‑331/16 and C‑366/16, EU:C:2018:296, paragraph 40 and the case-law cited).
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