thanks for the e-mail with links.
So now I would ask why a conventional although advanced design like the SU-37 should use plasma-stealth? It would be better fitted (if it exists and works) on a purposely built new design. The S-37 itself looks to me less advanced than the Flanker: look at its fuselage, it doesn't have the blended wing body of the Flanker. Its overall design seems to be thought only to experiment the Forward swept wing.