Mikhail Gorbachev heard the click on the line. His communications, including the line to his nuclear briefcase, went dead. Eight men, including his own vice president and the heads of the KGB and military, had formed the State Committee for the State of Emergency. They announced Gorbachev was ill and seized control. Tanks rolled into Moscow. The plotters aimed to halt the reforms of perestroika and glasnost, and to preserve the Soviet Union.
The coup mattered because it was both a climax and a catalyst. It was the old guard's last, clumsy attempt to restore the Brezhnev-era order. Their failure was immediate and spectacular. They had detained Gorbachev but failed to arrest his rival, Russian President Boris Yeltsin. Yeltsin climbed onto a tank outside the Russian parliament, denounced the junta, and became the symbol of defiance. The military hesitated. The public, particularly in Moscow and Leningrad, rejected a return to fear. Within three days, the coup collapsed.
The event is often framed as the cause of the USSR's end. It was not. The union was already fracturing from economic strain and nationalist movements. The coup's true function was as a political accelerant. It utterly discredited the Communist Party, the army, and the KGB. It destroyed the center's remaining authority. In the coup's aftermath, Yeltsin banned the Communist Party in Russia and recognized the independence of the Baltic states. Gorbachev returned to Moscow a figurehead. By December 25, the Soviet flag was lowered for the last time.
The August Coup demonstrated that power, even when it commands tanks, relies on perceived legitimacy. The plotters had the formal titles but no public consent. Their botched operation provided the final, decisive push, turning a gradual disintegration into a sudden and irrevocable dissolution.