But a manned or unmanned aerial vehicle equipped with SAR is more ideal to shoot pictures of smaller(unrecognisable) facilities.Moreover you can tweak such a platform with sensors to detect biological or chemical agents.
Yes, but in the case of North Korea the last thing you want to give them is the opportunity to shoot them down. UAVs are all vulnerable to air defences. This isn't the Cuban Missile crisis and neither the operations of UAVs over Vietnam scenario. The North Koreans would be expending SAMs and triple AAA by the bucket load. It just isn't happening.