I have to admit I really don't know very much about Turkmenistan, Tajikistan, or Uzbekistan, and Iran doesn't exactly seem friendly, but I'm wondering: when small nations like Afghanistan provoke us, why not just invade, conquer, and then distribute their lands to their neighbors, thus erasing the country off of the map forever? I'm sure their neighbors wouldn't mind being granted new territory. If Afghanistan's case, we could even give some of it to China if we wanted, since they have a small common border to the North East.
I think that would solve the whole problem of setting up a new government. All the citizens immediately become subjects of the governments that claimed their lands.
https://maps.google.com/maps?hl=en