Just a couple of points
More infromationon the Buran spacecraft can be found here
http://en.wikipedia.org/wiki/Buran_(spacecraft)
the artcile states that four other shuttles were in the pipeline as of 1993 and another unmaned fligth of the Buran was planned for 1993.
I don't think they put any life support systems in it, so that is why it's missions were unmanned
A few other Soviet Space items are
Energia: A heavy-lift expendable launch system as well as a booster for the Buran spacecraft
http://en.wikipedia.org/wiki/Energia
Mikoyan-Gurevich MiG-105 Spaceplane: Developed is response to the USAF X-20 Project
http://en.wikipedia.org/wiki/Mikoyan-Gurevich_MiG-105
Almaz: The Almaz program was a highly secretive Soviet armed military space station program, which began in the early 1960s.