A frightening prospect...
I still think that China would much rather let the US and South Korea take the heat initially, destroying the North's infrastructure and offensive capabilities, and then send in masses of troops later for "peacekeeping" purposes (read: occupying forces).
Russia has also added its condemnation to North Korea's recent actions:
North Korea's two main allies / apologists are very much turning their back now. It's really getting hard to see where they can go from here now. Turning up the volume is not working, and they are getting further and further from any kind of deal with the US.
The only outcome I can see is that NK keeps pushing up the rhetoric until the end of the month (when the US South Korean annual training operation ends), and claim that they have "scared the US away". Obviously the international community would see the truth, but if Kim Jong Un is looking for a way to save face domestically then this could be his only option.