Interesting question. I think that the South Korea is fed up with North Korea getting away with murder. I think that at this point ,all options are on the table. But the U.S. would have to be included in the consultations since there are U.S. troops there
What is your opinion Tiger?
Pres himself also appears to feel double-crossed. All this create a strong push for some kind of action. The relation with China also ran into a problem, because of China's full embrace of Kim Jong-il's visit, and subsequent statements siding with N. Korea over S. Korea.
I think the response will be nonmilitary. There are some strong nonmilitary action which has teeth. The question is whether SK and U.S., especially Obama, would go for it. The trick is to hit China rather than N. Korea by some means China would notice.