Depuis 2001, l'UE a mené plus d'une vingtaine d'opérations militaires et de missions civiles, et elle est désormais considérée comme une organisation majeure dans le domaine du maintien de la paix.Longtemps perçue comme une organisation intergouvernementale, la mise en place d'une structure européenne de gestion des crises intégrée au coeur de l'organisation, ainsi que la délégation de la gestion courante de la crise aux organes européens, ont participé à l'autonomisation progressive de l'UE par rapport à ses Etats membres. Cette autonomisation de l'organisation se manifeste également dans l'ordre juridique international. Tout un corps de règles s'applique alors à l'UE du fait de son intervention dans l'ordre juridique international, notamment les règles relatives à la responsabilité internationale des organisations régionales. L'intervention effective de l'Union européenne dans le domaine du maintien de la paix – en tant qu'organisation régionale – s'inscrit dans un cadre juridique imprécis. Or, le phénomène de régionalisation a pu être interprété comme portant préjudice au système de sécurité collective instauré par la Charte des Nations unies. Partant,deux aspects de l'intervention effective de l'UE appellent analyse : celui de la conformité de son action au cadre onusien et celui de sa contribution aux évolutions du maintien de la paix / Since 2001, the EU has conducted more than twenty military operations and civilian missions, and is now seen as one of the leading organizations in the field of peacekeeping. For a long time perceived as an intergovernmental organization, the establishment of an integrated structure for crisis management into the heart of the organization, as well as the delegation of this crisis management to the different European organs, have contributed to the gradual empowerment of the EU toward its member states. This process of becoming autonomous is also evident in the international legal order. A large set of rules thus applies to the EU due to its involvement in the international legal order, including rules relating to the international responsibility for regional organizations. The effective intervention of the European Union in the field of peacekeeping – as a regional organization– is in keeping with an unclear legal framework. However, the phenomen on of regionalization could have been interpreted as prejudicing the collective security system established by the UN Charter.Two aspects of the effective intervention of the European Union call for analysis : the conformity of its action to the UN framework and its contribution to the evolution of peacekeeping

Topic of this diploma work is Common Foreign and Security Policy (CFSP) - legal aspects. CFSP is one of policie sof EU based on intergovermental cooperation in foreign relations and defence policy which includes Common Security and Defence Policy (CSDP). The second part of the diploma work describes history of CFSP from WW 2 to describing of Treaty on European Union (TEU). The third part of diploma work describe CFSP of EU in TEU from 90's to current wording. Main topics are instruments and institutions and voting procedure. Marginally I write something about Common Commercial Policy and Cooperation with Third States in the fourth part of diploma work. The last part of diploma work is about the CSDP and EU millitary and civil missions. The content of the work is about CFSP and related issues, therefore I write the basic information about CFSP below. CFSP (as Europian polical cooperation) was established in 70's in last century by member's states for cooperation in foreign policy. In 1992 CFSP was incorporated in TEU and built as authority of Union in second pillar. CFSP was novelised by Amsterdam Treaty and Nice Treaty and Lisbon Treaty as last novelisation. Today is cancelled the Three Pillar structure and CFSP is classified in other external action of EU. Treatment of external action is divided between...