In all of the instances mentioned, I would try and counter in the same overall manner, which is to use up China's obsolete 50's and 60's inventory as Drones or remote controlled machines, primarily for forcing such systems to give away their positions and become vulnerable to counter strike.
This accepts that such systems cannot be stopped from hitting, so make sure that they hit nothing of real value.
This accepts that such systems cannot be stopped from hitting, so make sure that they hit nothing of real value.