A picture taken on August 19, 1991 shows

A picture taken on August 19, 1991 shows Soviet Army tanks parked near Spassky gate (L), an entrance to the Kremlin and Basil's Cathedral (C) in Moscow's Red Square after a coup toppled Soviet President Mikhail Gorbachev. Russia marks on August 19-22, 2011, the 20th anniversary of the abortive 1991 coup against then Soviet president Mikhail Gorbachev. Tanks rolled through Moscow towards the Russian White House, where Boris Yeltsin, leader of the Soviet-era Russian republic at the time, gathered his supporters after denouncing the coup from the roof of a tank, which resulted later in the collapse of the Soviet empire. AFP PHOTO / DIMA TANIN (Photo credit should read DIMA TANIN/AFP via Getty Images)