Opinion 2/13 of the Court (Full Court). Accession of the European Union to the European Convention for the Protection of Human Rights and Fundamental Freedoms.

On the Compatibility of the draft agreement with the EU and FEU Treaties: a resounding “no”.

The agreement on the accession of the European Union to the European Convention for the Protection of Human Rights and Fundamental Freedoms is not compatible with Article 6(2) TEU or with Protocol (No 8) relating to Article 6(2) of the Treaty on European Union on the accession of the Union to the European Convention on the Protection of Human Rights and Fundamental Freedoms

See the whole text here.