“Lost Kingdom: The Quest for Empire and the Making of the Russian Nation From 1470 to the Present,” by Serhii Plokhy. New York: Basic Books,. 2017. ISBN: 978-0-465-09849-1. $32 (hardcover), 398 pp. ISBN: 978-0-465-09739-5. $18.99 (e-book). The collapse of the Soviet Union in 1991 caused observers to ask, “What should the relationship be between the...