One other thought -- in 1969 North Korea shot down an unarmed Navy reconnaissance aircraft in international airspace (100 NM off the coast) as a birthday present for un's grandfather, Kim Il-Sung.

Naval History Blog » Blog Archive » 15 April 1969: Deep Sea 129 Shootdown
Quote:
...North Korea not only acknowledged the shoot down, they loudly and boastfully celebrated their action. President Nixon suspended PARPRO flights in the Sea of Japan for three days and then allowed them to resume, only with escorts. No reparations were ever paid to the US or the families of the lost airmen.
And Kim Il-Sung celebrated another birthday (April 15th). ...

Kim's threat of a shoot-down due to a renewed state a war rings hollow, as an active state-of-war has been shown to be unnecessary for the Kim's to shoot down US military aircraft.