Unfortunately, the U.S. has been giving North Korea a pass for a long time when it comes to their missiles...
US frees N Korean vessel carrying missiles - Thu, Dec 12, 2002,
http://www.irishtimes.com/news/us-frees-n-korean-vessel-carrying-missiles-1.1107134
“The United States reluctantly handed over a boatload of Scud missiles to Yemen yesterday after the Yemeni government promised the weapons would not end up in the hands of terrorists.
Following high-level talks between the two governments, the US navy was ordered by Washington to release the unflagged cargo ship, which was carrying the Scuds from North Korea when it was stopped by two Spanish warships on Monday in the Arabian Sea and searched.
US concerns about the shipment centered on fears the Scuds could be mounted with warheads filled with chemical, biological or nuclear materials by Iraq or another rogue state or terrorist organization.”
Jan 23, 2013 - These defense radars detect low flying aircraft infiltrating our borders. ... southern border, then wouldn't we want as many early warning systems as possible ...