who initially supplied the arms and the plans to make them, were the good ol (crazy) USofA. As well as Britain and I'm sure a host of other western countries.
If you don't want the insane to play with matches you'd be insane to give matches to them.
i'm sure with all the pinpoint technology they have, they'd notice a rather large covert deal going down on the boarder between two parties of suspicious looking characters. I mean, really, the place is only as big as clifornia, right?