S'agissant de leur collaboration, j'évoquerai tout d'abord les dispositions générales de l'article 4, paragraphe 3, et de l'article 13, paragraphe 2, du traité sur l'Union européenne (TUE), conformément auxquelles la coopération entre l'Union européenne et les États membres, comme celle entre les différentes institutions de l'Union, doit être "loyale".
As regards their cooperation, I would like to refer, first, to the general provisions in Articles 4(3) and 13(2) of the Treaty on the European Union (TEU), according to which the cooperation between the EU and its Member States, as well as the cooperation between the EU institutions among themselves, shall be ‘sincere’.