As if vietnam has lots of missile? How many platform do vietnam have to launch those missile?It remains to be seen if 052D can really handle supersonic missiles like yakhont / brahmos and anyway, if enough of a saturation attack, 052D will get hit, it can only intercept so many missiles at a time.
China do have lots of supersonic missile like CX-1 and CM-400 which we have tested against our air defense. Remember those missile are merely for export and not intended for PLAN. IF supersonic missile are such wonders that we do not know how to counter. We would have long induct them in large number for our fleet or armed forces.