The implosion of the Soviet Union was the culmination of a gripping game played out between two men who intensely disliked each other and had different concepts for the future. Mikhail Gorbachev, a sophisticated and urbane reformer, sought to modernize and preserve the USSR; Boris Yeltsin, a coarse and a hard drinking "bulldozer," wished to destroy the union and create a capitalist Russia. The defeat of the August 1991 coup attempt, carried out by...