Tiger what’s your analysis on the response, that South Korea, and the U.S. as well the rest of the allies, will be? Will it be the usual response, condemneding, followed by strong sanctions and so forth. Or will be it something different?
As for S. Korea, it may pull out of joint industrial complex in N. Korea's Kae-sung, where S. Korean companies manufacture products with N. Korean employees. It was set up more than 10 years ago, when S. Korean government was run by those who favor appeasement of N. Korea. Due to the danger of hostage crisis, when S. Korea attempts to pull out, and other factors, it has been allowed to operate until now, but that could change. Another development could be that S. Korea will approve the deployment of THAAD missile defense system. Due to vehement opposition by Chinese, it has been delayed, but this could also proceed.
General public are pretty upset over N. Korean belligerence and China's complicity. Survey shows that a majority of them favor S. Korea's own nukes. I don't think that it is politically possible, though.