Just because an enemy has developed a capability it doesn't mean we have to counter it using the same capability (symmetrically), they choose a tactic, a tool, cause they think they are better in it, refusing to acknowledge it is called stubbornness and is equal to defeat.
even if we had the F22 technology, we still wouldn't count on it against U.S, their budget is tens of times higher, they can afford any loose, we can't.
amount of Russian's success in Syria is in question, specially when the defeated ones only blame Iran and not Russia, afterall this is the same air power (weaker actually) which once failed against similar rebels, remember?
but I can mention other example of unsuccessful cases against those who didn't limit themselves to conventional war theories, and the legendary one was Israel against Hizbollah.