With a RCS less than a bumble-bee, no SAM can see it. Truly.
The F-22 can be seen on radar. The Brits seen it and our people see it at red flag. A US F-18 (defeated one in a dogfight,everything is always situational). The Russians will be at a great disadvantage against the F-22 because of low RCS and jamming but it can been seen. They also have IRST on the SU-30’s and the F-22 lets off heat just like any other jet. I love the F-22 and I have played many video (i assume you have as well as the idiotic gaming community thinks stuff like this is invulnerable)games with jets and read many defense forums etc.
The hubris of thinking the F-22 is invincible is to invite disaster. The Russians are not stupid people like the sand people we have fought for 15 years. They have had passive radar for years as well and they have excellent SAM systems. Yes its a great jet but it can be shot down, not to mention intel gathered off its profile while in combat. Which is why we should only use our ace’s when in a truely hot war not Syria.