Case C-22/20: Judgment of the Court (Fourth Chamber) of 2 September 2021 — European Commission v Kingdom of Sweden (Failure of a Member State to fulfil obligations — Directive 91/271/EEC — Articles 4, 5, 10 and 15 — Urban waste-water treatment — Secondary or equivalent treatment of urban waste water from agglomerations of certain dimensions — More stringent treatment of discharges into sensitive areas — Article 4(3) TEU — Verification of data provided by the Member States — Obligation of sincere cooperation)