Well, I am concerned about both Iran and N. Korea.

Regarding North Korea. I agree very much with the comments that since they don't care that much for their own people, they will care even less for foreigners. I think North Korea lacks the ability to make 'real trouble', primarily because they are isolated by China and South Korea. However, I think their talk is very fierce, and where there is a will...their is a way...

As for Iran. I think Iran has the culture of the masses that is of great concern. However, to some extent they currently scare me less. Not sure why.

I find the situations very troubling in any case.