Which is the role of the European Union in dealing with crises that go beyond the nation states borders – terrorism, proliferation of weapons of mass destruction, regional conflicts, state failure, organised crime, natural and man-made disasters? The authors assess the main challenge for the EU: the need to operate in a multidimensional setting where with a wide range of actors, such as member states, national and international NGOs, international organisations (NATO and the UN in primis), as well as a wide range of activities, rules and norms are generated for these diversified crises.