Russia has been making in-house AESA for a decade. they started with APAR radar in 1963, just a few years off from the US.
http://www.ausairpower.net/APA-Zhuk-AE-Analysis.html
they also sell the only radar capable of (on the open market) detecting hypersonics, the 59Н6-ТЕ mobile radar.
But if you can get something lofted to get in its way before it hits you, it is unlikely to survive that.
I thought that was one of the key abilities of hypersonic missile: that they can indeed steer around things?
That said, this is far far outside my wheelhouse, so I admit to ignorance.
The bad news is Hypersonic glide vehicles can steer around.
They've been turned into bumbling idiots on Twitter and Reddit. It's a shame, but in my mind it is quite dangerous because sooner or later some president/general is going to make a very bad decision based on that meme. "How could their nukes possibly work?"
I saw some articles implying that they thought so too but are actually using a lot more Chinese components even as substitutes for military grade components. Given that the portion of US companies make a military and commercial grade component with only thermal differences, I would wonder if they aren't getting a lot of commercial grade versions of US designs from China.
It would be interesting if someone goes through their wreckage strewn about and starts to catalog the finer details of some of the small components.
They do and have had it since 1960's, see https://en.wikipedia.org/wiki/Mikron_Group
The process is not as advanced as the TSMC's one, but they seem to have progressed (or have been progressing?) to 28-45 nm technological process in 2018.
I think China makes Russian AD built under license, so from the local Chinese suppliers.