CH-4 apparently going out of favor, Arab's probably were unable to maintain them as according to this article number of active export units decreasing. Being piston engine driven these would be maintenance heavy.
https://nationalinterest.org/blog/buzz/why-no-one-wants-buy-chinas-ch-4-killer-drone-anymore-92546
China has better drones and for LOC these would be easy to shoot down by India. For western front these would be great but for eastern front Pakistan needs to look at low observable UCAVs/Satellites. Can also go really small and discrete as well launch recover from forward bunkers.