this all falls on kim jong-un's 33rd birthday. will ripley is live from north korea, from pyongyang. will, what's the latest? >> reporter: alisyn, we know in south korea they are now beefing up cyber defenses, anticipating retaliation on the cyber front from north korea which has been suspected of major hacking attacks in the past. the pyongyang's regime biggest active aggression or perceived active aggression by much of the outside world happened when the supreme leader kim jong-un signed the order authorizing a nuclear test. north korea's fourth nuclear test in some 15 years. and the shock waves from that are still being felt. china condemning the act which is pretty unusual considering the china and north korea have been friends and allies for fight some time. their relationship seems to be doing pretty well as of late.