Case C-632/20 P: Judgment of the Court (Grand Chamber) of 17 January 2023 — Kingdom of Spain v European Commission (Appeal — External relations — Stabilisation and Association Agreement between the European Union and the European Atomic Energy Community, of the one part, and Kosovo, of the other part — Electronic communications — Regulation (EU) 2018/1971 — Body of European Regulators for Electronic Communications (BEREC) — Article 35(2) — Participation of the regulatory authority of Kosovo in that body — Concepts of ‘third country’ and ‘third State’ — Competence of the European Commission)