The drama was confined to one small area — around the White House in Moscow, home of Russia’s Parliament — and lasted a few hours. The bungling putschists failed to arrest any of their targets or to control communications, and soldiers refused to fire on the crowds outside the White House.

To his own amazement, Yeltsin was not apprehended at the start of the operation. Indeed, the central image of the August coup is of a brave and vigorous Yeltsin climbing onto a tank to make a defiant statement denouncing the plotters. And he retained a telephone line enabling him to coordinate his support. This stirring scene was foolishly allowed to be shown on TV that evening, turning the obscure Yeltsin into a figure of world significance overnight.

The joke swiftly went around Moscow that you knew Communism must be through in Russia when the Bolsheviks couldn’t even mount a proper coup. At a news conference that evening, the nominal head of the Emergency Committee, the Soviet vice president, Gennadi I. Yanayev, was seen in public for the first time. A gray 53-year-old bureaucrat with nicotine-stained fingers and a shiny suit, he was visibly drunk. When he told the lie that Mr. Gorbachev was ill, his hands shook and his hairpiece began to slip.

For all the tragedy and farce of those three August days, the world has plenty for which to thank the incompetent conspirators who hastened the fall of an empire. Less than a week after the coup fizzled, two of its leaders killed themselves, the others were in jail and the Communist Party they sought to save was banned. Yeltsin, the party’s principal assassin, was the most powerful man in the country.

For a generation, the failure of Soviet Communism had been evident for all to see. The great experiment that once bred idealism ended in food lines and prison camps. Marx believed that man could be made perfect; Communists found that people had an irritating way of refusing to be perfected.

Yet despite the revolutions in Eastern Europe in 1989, hardly anyone in the summer of 1991 predicted that the U.S.S.R. itself would fall apart by the end of the year. It might have limped on for decades, as the Ottoman Empire did in the late 19th century, dying slowly amid civil wars. Yet the second most powerful country in the world simply withered away, not in the classical Marxist sense, but it literally ceased to exist. And the manner of its going was one of the best things. The Soviet people destroyed the Soviet Union, not outsiders, and not through violent conflict.

BUT what followed has not been a democratic idyll. Despite the putsch’s failure, some Soviet residue remains — a “coup culture” that breeds a winner-take-all view of politics. In Russia today, there is no concept of a loyal opposition, no separation of powers, no mass participation in political life and a news media that is far from free.