Since the end of the Cold War, significant attention has focussed on the issue of nuclear deterrence and in particular whether formal nuclear security guarantees from nuclear weapons states to non-nuclear weapons states involving the possible use of nuclear weapons have a place in the twenty-first century global strategic landscape. Growing support for nuclear disarmament in the US and elsewhere has seen serious doubts being raised about the ongoing utility of extended nuclear deterrence. This book provides the first detailed analysis of the way in which extended nuclear deterrence operates...