This complicates Indian planning greatly, even at a 250km range it means all stand off weapons bar Bhramos (of which they only have a few capable aircraft to fire it) will be out ranged. Even Brahmos will have to be fired at extreme ranges. Further it provides a 250km air defence umbrella around Karachi making life very tough for the Indian Navy.This is excellent news ad a step in the right direction - good to see Pakistan "finally" sees the value of long range SAMs - I suspect this is one of the lessons 'learnt' from the Feb 2019 incident - and while the range may not be what Pakistan requires ie 400km - it offers the stepping stone to 400km as China will improve the HQ-9 series to be a competitor to the S400 and when that happens, Pakistan will purchase it.
Of course, if Turkey produces a system of that class - then of course Pakistan will take a look - but Pakistan has now taken the first step.
Given that Pakistan has now "offically" bought into the HQ-9 series, subsequent versions will be much easier to integrate to the AD network as alot of the ground work will have been done by this procurement.
Any indication anywhere of how many units have been purchased ?
Additionally US will now know that the air corridor it has over Pak can be shut done in an instant by a system they have very little knowldge of (HQ-9 not been exported to anyone else yet)