The 2014 crisis in Ukraine sent a tottering U.S.-Russian relationship over a cliff - a dangerous descent into deep mistrust, severed ties, and potential confrontation reminiscent of the Cold War period. In this incisive new analysis, leading expert on Soviet and Russian foreign policy, Robert Legvold, explores in detail this qualitatively new phase in a relationship that has alternated between hope and disappointment for much of the past two decades....