If either North Korea or Iran tests a nuke, we'll have a real brief time window - maybe 100 days - to invade Iran before their number of missile-ready warheads increases from 1-3 U-235 gun-type warheads to 1-2 dozen, most of them of the plutonium-implosion type.
Then low and behold, the US military forces suddenly went in with total full force one night in November, and totally kicked the crap out of the Taliban.
Don't be so sure that 'nothing' is happening. I know the frustration, but there is a lot at work here behind the scenes, including (probably) assassination plots against Kim Jong il.