Putin znal(knew) many months ago that B could not help the fight against C. The trial was done under his watch in his hospitals. He doesn't know if works?
Of course he knows. And it failed. Or it woulda been rolled out across Russia a very long time ago.
ZERO chance...if the Russian trial was a success, Putin & Russia would be wildly distributing B to stem the current Wave of infections. This is probably a good barometer of the Russian trial results.