73Where it is apparent that the subject-matter of an agreement or convention falls partly within the competence of the Community and partly within that of its Member States, it is essential to ensure close cooperation between the Member States and the Community institutions, both in the process of negotiation and conclusion and in the fulfilment of the commitments entered into. That obligation to cooperate flows from the requirement of unity in the international representation of the Community (Ruling 1/78 [1978] ECR 2151, paragraphs 34 to 36 (by analogy with the EAEC Treaty); Opinion 2/91 [1993] ECR I-1061, paragraph 36; Opinion 1/94 [1994] ECR I-5267, paragraph 108; and Case C-25/94 Commission v Council [1996] ECR I-1469, paragraph 48).
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