The Treaty of Lisbon has created a new impulse, for the external activities under taken by the European Union, confirming its role as an international actor. As the Article 24, section 2 of the TEU reads: "Within the framework of the principles and objectives of its external action, the Union shall conduct, define and implement a common foreign and security policy, based on the development of mutual political solidarity among Member States, the identification of questions of general interest and the achievement of an ever-increasing degree of convergence of Member States' actions". The Common Defence and Security Policy constitutes an integral part of the Common Foreign and Security Policy. Despite the deepened collaboration, the national security still remains "the sole responsibility of each Member State".
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