Crystal clear is the meaning of such intensified preparatory spying on the core facilities and sites in the DPRK.
The situation obviously indicates that to bolster up the muscle for self-defence to thoroughly aim at, deter and frustrate the reckless manoeuvres of the U.S. and its vassal forces is a top priority task to be fulfilled with accelerated efforts, indispensable for safeguarding the national sovereignty, security and interests.
The Ministry of National Defence of the DPRK has already clarified the stand that it would take action immediately in case national sovereignty, security and interests are exposed to violation.
The U.S. and other hostile forces are bound to meet unforeseen disaster for their bluffing and reckless espionage.