In the mid-1970s, the Soviet Union implemented the Buran program - a program in response to NASA's shuttle program at the time. This ambitious project shattered just after an unmanned test flight. Many traces of the project still exist today.
For more context, see Why did the former Soviet Union fail in the race to the Moon?.
Construction of Soviet shuttles continued during the 1980s, culminating in the launch of the 1988 unmanned Buran space shuttle plan. Many subsequent transfers were canceled due to lack of experience. but the equipment in this project is still retained.
