For every major military invention in human history, there has quite always been a countervailing technology. Nuclear weapons have, however, remained an exception. Ballistic missile defence (BMD) has, in recent years, emerged as a formidable means to defend against nuclear-armed delivery systems though yet to prove their total reliability. What does the advent of BMD mean for the nuclear revolution - will it make nuclear weapons obsolete or in turn lead to a new arms race among great powers? This book is a concise volume that examines these strategic dimensions of missile defences, mainly its impact on deterrence. It promises thematic variety by incorporating a technological survey that explains the evolution of BMD concepts and also includes a case study of Southern Asia that throws light on BMD dynamics in a volatile region. The volume balances new conceptual inquests with policy analysis that will make it useful literature on BMD for academics and policymakers.