87It should also be recalled that, in accordance with settled case-law, the Union is bound, when exercising its powers, to observe international law in its entirety, including not only the provisions of international conventions that are binding on it, but also the rules and principles of general customary international law (see, to that effect, judgment of 27 February 2018, Western Sahara Campaign UK, C‑266/16, EU:C:2018:118, paragraph 47 and the case-law cited).
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