If you check the Aviastoitel website http://aviastroitel.nm.ru/, the
Russians are listing developing a jet powered sailplane as a future
project. Might try Babelfish for translation from Russian to English
if needed.

For reference, the coventional self-launch Russia AC-5M and the Silent
are essentially powered by the same 28 hp, 2-stroke engine.

The Russians also have replaced the 28 hp engine with a 80 hp Rotax
912 engine...just to create a new sport plane/motorglider. Video on
the Russian website shows the plane really climbing out on takeoff.

Also an interesting video of dropping a Russia sailplane from a
hot-air ballon, followed by the glider doing a tailslide back near the
ballon's basket. A bit crazy...but thats how you need to think when
it is time to go get the jet engines.