Just some food for thought...
China, (GDP $12T), Japan (GDP $4.
, and S. Korea (GDP $1.5T) are ranked as 2nd, 3rd, and 12th respectively, largest economies in the world. Just for contrast, the US
ofA GDP who has the largest economy in the world is $19.4T.
So what do you think would happen IF N. Korea starts a war in the region? Would this fuel a total collapse for the region or the world? If not a collapse, what then?
Add to that thought, how would a war in Korea affect other countries that are involved in the region too: Russia (GDP $1.6T), Australia (GDP $1.4T), and Indonesia (GDP $1.0T) which are ranked the 11th, 13th, and 15th respectively economies in the world.
Foot Note: Used the following link for my numbers.
List of Countries by GDP.