Cruising altitude, km 9 000 - 12 000
I think you will find that is a typo for 9000m to 12000m. Most eastern bloc ( Is it still OK to say that ?
) work their flight levels in meters and not feet so that is roughly 27,000 to 36,000 feet or FL270 to FL360 in imperial speak.
Hope it helps
David
The Buran she was built to carry might manage 9000km altitude though