Case C-459/03: Judgment of the Court (Grand Chamber) of 30 May 2006 — Commission of the European Communities v Ireland (Failure of a Member State to fulfil obligations — United Nations Convention on the Law of the Sea — Part XII — Protection and preservation of the marine environment — Dispute-settlement system provided for under that convention — Arbitration proceedings initiated on the basis of that system by Ireland against the United Kingdom — Dispute relating to the MOX plant at Sellafield (United Kingdom) — Irish Sea — Articles 292 EC and 193 EA — Undertaking not to submit a dispute relating to the interpretation or application of the Treaty to a method of settlement other than those provided for by the Treaty — Mixed agreement — Community competence — Articles 10 EC and 192 EA — Duty of cooperation)