The present book is an in-depth systematized study of diversified efforts of States, statesmen and diplomats to prevent a nuclear war. It records the international concern for achievement of disarmament and prevention of proliferation nuclear weapons as a common objective of all States. The cold-war rivalries, the collective security system of United Nations, the moves for disarmament of States involving nuclear weapons, the politics of maintaining the hegemony of five Superpowers, need for petrol leading to oil diplomacy of the West and several other factors associated with problems of new States have evolved into identifiable 'nuclear diplomacy' since 1960s. Keeping States away from nuclear weapons for achievement of national ambitions is seen as basic subject matter of nuclear diplomacy. The book examines the efforts of States to prevent proliferation of nuclear weapon technology in general and to such States in particular that might seek to use it for achieving national ambitions.