18 See the relevant website of the Council of the European Union on the ratification process of the two agreements: www.consilium.europa.eu/en/documents-publications/agreements-conventions/agreement/?aid=2011057 (last accessed 1 September 2016). The second reason for the importance of loyalty in mixed agreements is that, by their very nature, these agreements constitute a threat to uniform action and to the uniform image of the Union and its Member States externally.48 This international dimension explains the difference in importance of Article 4(3) TEU compared to its role in the exercise of internal competences. 49 and even in relation to the exercise of external competences in a single-sex environment. This particular situation is reflected in the recurrent topos of the Union`s “unity of representation” at international level in the case law on gender diversity. This also happens when the Union`s international agreement is concluded with the Member States in the framework of a mixed agreement. Thus, in MOX Plant, after explaining that the European Union has shared competence in the field of environmental law21, the Court goes on to say that `it is necessary to examine whether and to what extent the Community, through the Contracting Party to the Convention, has chosen to exercise its external competence in matters of environmental protection`22. . . .