it's already friday in north korea, which is about to celebrate kim jong-un's birthday as it also celebrates his claim of a hydrogen bomb test. in a cnn exclusive, our will ripley is the only american television correspondent inside north korea right now. he's joining us on the phone from pyongyang, the capital. will, there's very harsh worldwide reaction. are the north koreans worried about new sanctions that are about to be imposed? >> reporter: wolf, i met with some north korean officials last night who told me not only are they not worried but they are expecting additional sanctions as a result of this fourth nuclear test, a test they insist is a hydrogen bomb in spite of objections from a number of international experts. north koreans told me that they have lived under crippling sanctions for so many years that additional sanctions really won't have any impact on this country. i'm standing here by the way i'm talking on the phone because our live signal went down. we often have transmission