CIA will never make other countries made super weapon
ROFL. North Korea has already produced the super-weapon (Hydrogen bomb) and there is nothing that your CIA can do about it. All they can do is to bully the smaller and weak nations such as Libya and Syria. Their tricks will never work against powerful nations such as North Korea and Iran. CIA is no longer the most powerful organization in the world.
The problem with missile shield is that it is not 100% effective. A recent statement by an American official claimed that it is only around 40% effective, meaning that if the DPRK fires 10 nuclear missiles, then 6 of them will hit the target. The Russian S-400 is more accurate, but they are not going to sell these systems to the Americans.