The billions of dollar that r sent to Pakistan are by Pakistani workers in the Middle East, while those residing in North America don't contribute any thing but rather are an embaressemt to Pakistan.
The only thing they have contributed lately is the spread of covid 19 as these infected...
When they arrived in Pak for trials they were a work in progress and PLA wanted input of PAA and its evaluation of the machine. Lots of PAA input where incoperated into the machine while it was in Pak and the rest and more when it went back.
And the result is the beast of a machine u see now
The thing with Pak- China relationship is such that if Pak wants somthing China will not refuse. Now how do u expect to get somthing when u dont even ask.
If Russia is a concern than u can always lease the equipment.
Around 1000+ Pak army personal serving in different capacities in saudi. N thats just the PA personal.
Largest concentation of PA personal is in khamis mushait, in the south.