hxxp://news.yahoo.com/south-korea-says-north-preparing-nuclear-test-065516133.html

It appears North Korea is getting ready for a 3rd nuclear test and have been testing missiles under the guise of sending satellites into orbit...

How come US does not go and bomb North Korean nuclear sites? North Korea has low yield nukes and have capabilities to deliver them.. at least short range. North Korea can kill millions of people if they drop a nuke on a dense city (North Korea often, in their rhetoric, say they will attack South Korea). North Korea could even sell a nuke to a terrorists group... The US is so eager to go do some bombing runs in Iran.

I doubt North Korea would use a nuke in practice, but you never know.