A bit more information about the Korean sinking here.

The South Koreans are in a very awkward situation. It will be interesting (as in the old Chinese curse) to see how this plays out.

Another question is, what kind of craft was used to launch the torpedo? The North Koreans have a wide range of platforms, from early Cold War Era Russian conventional sub designs, to midgets, planning hull semi-submersibles, torpedo boats, and “human torpedoes.” The more unconventional of these craft may make it to Iran and possibly on to terrorist groups.