As I recall, these aircraft were very hard to detect with modern radars but they showed up like a sore thumb on some older Soviet systems - different bands used.
Oh, yes. The Red Chinese may have modernized all their systems and thrown away the old ones. They might be hosed when it comes to the Nighthawks.
No radar in the world including our most advanced AEGIS, etc, can both reliably detect and target the U.S. stealth fighters and bombers. A spurious detection is of little use when targeting radars can’t get a lock on. Occasionally they might get a lucky shot (when the f117 flies the exact same track night after night — but we won’t do that again!!!).
That's news to me. I was still active duty then, and I don't remember that being so. The older the radar system, the stealthier it was. The Iraqis had plenty of old Soviet radar and didn't see it unless they went outside and looked with their own eyes.
Do you have a source?