Joined Cases C-274/11 and C-295/11: Judgment of the Court (Grand Chamber) of 16 April 2013 — Kingdom of Spain and Italian Republic v Council of the European Union (Unitary patent — Decision authorising enhanced cooperation under Article 329(1) TFEU — Actions for annulment on grounds of lack of competence, misuse of powers and infringement of the Treaties — Conditions laid down in Article 20 TEU and in Articles 326 TFEU and 327 TFEU — Non-exclusive competence — Decision adopted ‘as a last resort’ — Preserving the interests of the Union)