Migrations are closely linked with security. Migrants that want to escape the lack of security in their origin countries, may find new problems in their countries of destination. Neither the realistic nor the liberal approach provide satisfactory answers to this question. A third approach is possible, as shown by official EU strategy, but it is complicated. This third approach deals with a new concept of security, differentiating state and societal security and analysing the root causes of migrations. A dynamic concept aimed at coping with the change that characterizes the international system.