This book presents a comprehensive overview of Ukraines nuclear history beginning from its experiences within the Russian Empire in the early 20th century through the Soviet period to the emergence of Ukraine as an independent state that inherited the worlds thirdlargest nuclear arsenal. The book discusses the development of the nuclear infrastructure on Ukrainian soil and offers a rich and nuanced background of how Ukraine became an important and integrated part of the Soviet nuclear infrastructure. It further analyzes Ukraines nuclear disarmament based on extensive primary source material and places the Ukrainian nuclear reversal process in a larger international political context where Russias the United States and other players actions are interpreted in the light of the impact on the current nuclear nonproliferation regime.