The North Atlantic Treaty Organization or NATO is an intergovernmental military alliance based on the North Atlantic Treaty which was signed on April 4th 1949. The organisation constitutes a system of collective defence whereby its member states agree to mutual defence in response to an attack by any external party. This book presents new developments in the membership, operations and enlargement of NATO. Topics discussed include enlargement issues at NATO's Bucharest Summit; NATO and the European Union; the NATO-Russia partnership and NATO common funds burden-sharing.