Complications
Volkov and Krikalev were the only ones left on Mir. However, events at the U.S.S.R. complicated their stay. That August, just one month after Krikalev had agreed to extend his mission, Russia kicked things off.
Source: rt.com
However, on August 19th radical communists launched a military coup in Moscow because they were unhappy with the way things were going in the Soviet Union.