Russian Stealth Technology.

A recent post by Stealth spy regarding Russian plans to add RAM coatings to the Indian Mig-21 Bison upgrade inspired me to start this thread.
Have Flanker variants recieved any stealth modifications? (Su30MKI for example?)
I know that one Su-25 was built with stealth features incorperated-any photos?
What is the future of Russian Stealth Technology and what does it mean for the Pak fa?
Then of course there is the plasma stealth that is supposedly under development in Russia, but lets try to stick to things like airframe modifications and shaping and RAM coatings.

Discuss away!!!