Disorder erupted in Ukraine in 2014, involving the overthrow of a sitting government, the Russian annexation of the Crimean peninsula, and a violent insurrection, supported by Moscow, in the east of the country. This Adelphi book argues that the crisis has yielded a ruinous outcome, in which all the parties are worse off and international security has deteriorated. This negative-sum scenario resulted from years of zero-sum behaviour on the part of Russia and the West in post-Soviet Eurasia, which the authors rigorously analyse. The rivalry was manageable in the early period after the Cold...