75Likewise, the Court has held that the adoption of a decision authorising the Commission to negotiate a multilateral agreement on behalf of the Community marks the start of a concerted Community action at international level and requires for that purpose, if not a duty of abstention on the part of the Member States, at the very least a duty of close cooperation between the latter and the Community institutions in order to facilitate the achievement of the Community tasks and to ensure the coherence and consistency of the action and its international representation (Commission v Luxembourg, paragraph 60, and Commission v Germany, paragraph 66).
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