Could Russia Shoot Down an F-22 Stealth Fighter Over Syria?
War Is Boring

S-300 and S-400s have Tamara radar signature capabilities, the same capabilities responsible for taking down a F-117 over Serbia during the Bosnian conflict. The EM signature capabilities were originally develop by an outfit call TESLA Pardubice s.r.o. in the Czech Republic. I am sure there are more than adequate countermeasures.