I think you are missing one of the key ingredients to anti-stealth radar, and why we have shifted to a strong focus on RAM. That would help answer your own questions. I won’t say it here, but separately it certainly is possible to train against targets which would produce returns analogous to an F-22 or F-35 type aircraft to various radars.
On another note, US anti-air capabilities are already far behind the S-400. I understand we don’t have an immediate use case ourselves, but the lack of a credible AA system pushes potential partners like India and Turkey to fight with us for the right to buy the S-400.
On another note, US anti-air capabilities are already far behind the S-400. I understand we don’t have an immediate use case ourselves, but the lack of a credible AA system pushes potential partners like India and Turkey to fight with us for the right to buy the S-400.