NATO's military interventions in the Balkans hve transformed the alliance.As the alliance goes East, its members are compelled to rethink NATO's, and each member nation's, military and political roles. Offering a study of continuing change in the contemporary North Atlantic Treaty Organization, this book is constructed around eight essays by European security experts analyzing challenges confonting the Atlantic Alliance as a military alliance and as a collective security organization dealing simultaneously with deterrence, enlargment, and regional crisis intervention. The evidence is that NATO will undergo many more changes responding to actual and potential threats to Europe's peace. These range from a revival of the ethnic conflict in the former Yugoslavia to the proliferation and possible use of nuclear,biological, and chmical weapons. Also discussed is the matter of NATO's further enlargement and the question of whether this offers more or less security tothe alliance membership, as are the emerging tensions between the EU and NATO security regimes.