78Furthermore, even though Article 4(2) of Directive 92/50 and Article 14 of Directive 2004/18, upon which the Republic of Austria principally relies, afford the Member States discretion in deciding the measures considered to be necessary for the protection of their essential security interests, those articles cannot, however, be construed as conferring on Member States the power to derogate from the provisions of the FEU Treaty simply by invoking those interests. A Member State which wishes to avail itself of those derogations must show that such derogation is necessary in order to protect its essential security interests. Such a requirement also applies to the extent that that Member State relies, in addition, on Article 346(1)(a) TFEU (see, by analogy, judgment of 4 September 2014, Schiebel Aircraft, C‑474/12, EU:C:2014:2139, paragraph 34).
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