I am personally doubting this until more evidence is shown. That again, given how mountainous the terrain is, SAM sites may not even detect incoming munitions until it is hot, espectially if there is not effective AWACS support. India's air defenses are far less integrated with each other as well, so a stike is possible.Pakistan is claiming S-400 was taken down in Jammu, how likely is that?
It claims they used the CM-400AKG missile to do it