The story you have just read is historical fiction based on some actual events. What follows below is fact.
Mikhail Gorbachev, General Secretary of the Soviet Union, left Moscow to enjoy a vacation at his dacha on the Black Sea in Crimea on August 4, 1991. At the time, he faced increasing opposition from hardline communist leaders to his policies of glasnost and perestroika. He claimed that those policies would bring about political and economic restructuring, and greater transparency and accountability in government.
Gorbachev had signed an agreement with Soviet republics that decentralized national government and allowed them more autonomy. Hardliners feared that the agreement would lead to the dissolution of the Soviet Union. The chairman of the KGB formed a “Gang of Eight” consisting of highly placed Soviet officials, and on August 17, he flew to Crimea to meet with Gorbachev.
The KGB chairman’s objective was to require the general secretary to either sign documents establishing a state of emergency during which “order” would be restored, or to resign. When Gorbachev refused both alternatives, he was placed under house arrest. The KGB cut his communication lines, the state press reported that he was sick, and an emergency government was announced.
Gorbachev defeated the coup attempt, but it so weakened the Soviet government that on Christmas Day 1991, Gorbachev resigned as general secretary. The next day, the Soviet Union was voted out of existence. Another casualty of those events was the KGB itself, which officially ceased to exist.