¿This book explores the multilayer nexus among inter-related international and regional security parameters that critically define the EU¿s rapidly changing security environment. In terms of intensity, complexity and urgency these changes constitute challenges that threaten the very core of European security ¿ both internal and external. In a fluid and transitional international environment of diversified needs and polymorphic threats the space dimension acquires a novel unified meaning. The book closely examines the EU¿s current strategic, organisational and defence capabilities regarding global, regional and domestic challenges such as terrorism, systemic instability, global order and a number of crucial hindrances to transatlantic cooperation. The chapters offer not only