66So far as the concept of ‘public security’ is concerned, it is apparent from the Court’s case-law that this concept covers both the internal security of a Member State and its external security and that, consequently, a threat to the functioning of institutions and essential public services and the survival of the population, as well as the risk of a serious disturbance to foreign relations or to peaceful coexistence of nations, or a risk to military interests, may affect public security (see, to that effect, judgment in Tsakouridis, C‑145/09, EU:C:2010:708, paragraphs 43 and 44).
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