Actually, Uncle SAM has much stringent Rules for Foreign Arm trade control than Europe. Frequent Visit and routine check up of all your purchase to check, if there any manipulation in codes or seals. Pakistan is huge recipient of US weapon system ,also most of them are in the name on WOT. Do you think they are sitting tight ? From Mission Computer to Highly encrypted of Radio channels in F16 or any other Weapon are in American line of sight .This is One of The reason, why India never Signed any CISOMA FISMA etc and wanted to puts its own equipment on board.
Extremley wise and foresighted leadership indian