The best info that can be found publicly offcourse.
This is the same organisation that sets the time on the doomsday clock
http://www.thebulletin.org/nuclear_weapons_data/
this is a interesting discussion on how missile defense acctualy increases rather than decrease risks
http://www.thebulletin.org/article.p...ma04kristensen
and this is a article by a guy that has visited some nuclear sites in n.korea
http://www.thebulletin.org/article.p...fn=ja03alvarez