Case C-611/17: Judgment of the Court (Grand Chamber) of 30 April 2019 — Italian Republic v Council of the European Union (Actions for annulment — Common fisheries policy — Conservation of resources — International Convention for the Conservation of Atlantic Tunas — Total allowable catch (TAC) for Mediterranean swordfish — Regulation (EU) 2017/1398 — Fixing of fishing opportunities for 2017 — Exclusive competence of the European Union — Determination of the reference period — Reliability of the basic facts — Scope of judicial review — Article 17 TEU — Management of the EU’s interests within international bodies — Principle of relative stability — Conditions under which applicable — Principles of non-retroactivity, legal certainty, legitimate expectation and non-discrimination)