North Korea threatened specific bases in Japan and Guam

Jeez. North Korea is really living in its own little world over there

Either that or someone there has the same bright idea as Grand Fenwick in "The Mouse that Roared".

 Spoiler

The prime minister decides that their only course of action is to declare war on the United States. Expecting a quick and total defeat (since their standing army is tiny and equipped with bows and arrows), the country confidently expects to rebuild itself through the generous largesse that the United States bestows on all its vanquished enemies (as it did for Germany through the Marshall Plan at the end of World War II).