difficult to get into that airspace. >> barbara starr at the pentagon, and joining me now is cnn military analyst and former commanding general of the army forces in europe and also with us, retired army colonel and pentagon spokesman steve warren and jennifer ruben and a conservative columnist for "the washington post." how worried are you and how worried should we all be that north korea might have the ability to attach a hydrogen bomb to an intercontinental ballistic missile. >> that's of critical importance and we've also seen because as barbara just said, various seismic arrays that are measured the size of the force of this bomb from norway, all of the way to japan and there are seismic monitors that say this is a big one. that doesn't mean he can put it on a missile and make no mistake about that. it's much more difficult to have a nuclear weapon on the tip of