Many compromises were made in the pursuit of an advantage known to become greatly diminished 10 years into a 50 year lifespan. I don't think this can be written off by the arms race argument.

At a range of 60km that means 350m inaccuracy in azimuth and 100m inaccuracy in range.

350m is within IR and optical range, so any IR-capable missile can be cued in. The 9M96 missiles are rumored to have IR/optical capability but this is just a rumor, while the 9M100 missiles do have that capability.

As for radar missiles, the F-35 has a minumum RCS of 0.0015 sqm. Being generous to the F-35 and saying it must be detected by 1km, it means that any radar capable of detecting a 1sqm target at a distance of 25km can detect and F-35 at a distance of 1km.

This does require estimation but 25km range against 1sqm target is realistic.

This is close, and it's from 2014

https://news.usni.org/2014/07/29/chinese-russian-radars-trac...

VHF and lower frequency radars see right through any stealth coatings and bounce off the airframe, engines, etc.

Beyond that, neither Russia nor China are trading-off anywhere near as much as the US for stealth. Both of their designs are less stealthy but carry better weapons over a longer range with better kinematics at a lower cost.