58In order to interpret those provisions, it is necessary to refer to the rules of customary international law reflected by Article 31 of the Vienna Convention, which are binding on the EU institutions and are part of the EU legal order (see, to that effect, judgment of 25 February 2010, Brita, C‑386/08, EU:C:2010:91, paragraphs 40 to 43 and the case-law cited), and to the Convention on the Law of the Sea, which is binding on the European Union and which is explicitly referred to in the second paragraph of the preamble to the Fisheries Partnership Agreement and in Article 5(4) of that agreement.
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