Manned Soviet Venus glider?

Just when you think you've uncovered the last Soviet space secret:
http://www.airliners.net/photo/Sukha...83ec50f270058b
http://www.trkoed.dk/Foto/Monino_gal...s/P4160107.htm
Although shown as riding on the tank under it, I suspect its supposed to
fold up and go _into_ the tank, and that it's some sort of space
lifeboat to return stranded cosmonauts to Earth after separating from a
orbiting spacecraft.
Although the description there is BS, there are more photos of it he
http://discaircraft.greyfalcon.us/GDR%20Pirna.htm
The circular wing looks like it either unfolds or inflates.

Pat