In a Russian blog appears this modern-design engine with the model name BB-300 that doesn't seem aeronautical. A design from both engineers at their NKVD office, led by Nikolai Romanovich Brilling himself.

"BB-300, front, side and rear views"

"BB-400, side view"

"BB-400, front view"

-Coupling two BB_300, and with formidable reduction gear they built this aeronautical engine. Anyway we have little information so far.