In contrast to the Cold War era the new European order is characterised by uncertainty, fluidity and new security challenges including separatism, ethnic conflict and intra-state conflict. This book examines the process of change and its implications for: transatlantic relations, institutional development, regional stability and NATO's rationale. Balkan instability forms a major theme of the work illustrating the challenge for policy-makers. The book concludes with a discussion of NATO enlargement and relations with Russia.