Not a threat and never will be. The delivery of a successful missile launch over distances exceeding SCUD range (150km-) is problematic and nearly impossible for third world nations and retarded shit-pits like nK. The problem sets are numerous and demand a very sophisticated manufacturing and logistical tail to accomplish. One reason why Saddam Hussein's much vaunted WMD program only existed in the fever visions of defense apparatchiks in the Pentagram during Bushevik II's reign of terror in the Offal Office.
Sputnik and The Soviet Space Challenge, by Asif A. Siddiqi is an excellent read on why building big single and multi-stage launch vehicles is quite technically difficult.. Further things to look at would be the failed British ICBM project and the stalled Brazilian launcher efforts.