Most analysts consider non-strategic weapons to be shorter-range delivery systems with lower yield warheads that might be used to attack troops or facilities on the battlefield. These weapons have a lower profile in policy debates and arms control negotiations, possibly because they do not pose a direct threat to the continental United States. This book provides basic information about U.S., Russian, North Korean and Pakistani nuclear weapons. It begins with a brief discussion of how these weapons have appeared in public debates in the past few decades, then summarises the differences between strategic and non-strategic nuclear weapons. Historical background is discussed, describing the numbers and types of non-strategic nuclear weapons deployed during the Cold War by the U.S. and Russia, and in the past decade; the policies that have guided the deployment and prospective use of these weapons; and the measures taken to reduce and contain them. Also discussed is what is known about North Korea's nuclear weapons program and Pakistan's nuclear arsenal.