This paper aims at analyzing the emergence of European militaries capabilities--understood as a tool incorporated in a wider security continuum -- as the expansion of European bureaucratic struggles towards new arenas. Drawing on sociological work in EU studies and in International Relations, it presents an account of the EU-UN cooperation as a central locus enabling the construction of CSDP. The argument is articulated through a dual-dynamic of internationalization and autonomization, and on the role-played by the former High Representative for CFSP, Javier Solana, and his staff. [ABSTRACT FROM AUTHOR]