defense of the american homeland. cnn's will ripley joins us now with the latest. he's the only reporter from a u.s. news organization reporting from inside north korea. he's inside pyongyang. tell us about the fly over and how it's being receive there d had, will. >> reporter: it was an interesting move on the part of the united states. a lot of experts dispute it was a hydrogen bomb but a troubling situation for the united states. its key ally, south korea, japan, and the whole world. because it's a sign that the regime is actively growing the nuclear arsenal. so after north korea's last nuclear test in 2013, it took a full month before the united states decided to do a similar move where they flew a bomber very close to the demilitarized zone. they did it twice. they flew a b-52 and then they also flew a stealth bomber, a