It's fun to reflect on the claims I've seen over the years that Russian-built air defense systems would shoot down American stealth aircraft. 
In the first few days. F-22s, F-35s, and B-2s were used, and among other things they took out Iran's Russian SAM defenses. So, yeah those Russian SAM systems didn't "see" US stealth aircraft. Those first few days should have been, "Holy @#$%!" moments for the Russians. The Russian SAM defenses have not fared too well against Ukrainian drones, either.