Case C-660/13: Judgment of the Court (Grand Chamber) of 28 July 2016 — Council of the European Union v European Commission (Action for annulment — The European Union’s external relations — Access by the Swiss Confederation to the internal market — The Swiss Confederation’s financial contribution to economic and social cohesion in an enlarged Union — Memorandum of Understanding on a financial contribution by the Swiss Confederation to the Member States which acceded to the Union as a result of the 2004 enlargement — Enlargement of the Union to include the Republic of Croatia — Addendum to the Memorandum of Understanding concerning a financial contribution by the Swiss Confederation for the Republic of Croatia — Addendum signed by the European Commission on behalf of the European Union without the prior approval of the Council of the European Union — Powers — Article 13(2), Article 16(1) and (6) and Article 17(1) TEU — Principles of allocation of powers, institutional balance and sincere cooperation)