. >> announcer: amanpour on pbs was made possible b generous support of rosalynn p. walter. >>> good evening, everyone, and welcome to the program. i'm christiane amanpour in london with a global perspective. this was this weekend one year ago when donald trump officially took power, following his surprise election as president of the united states. the year has been a bumpy one, health care, media fights. outside the united states, it's no calmer. the president is facing serious threats and d a miscalculation could lead to all-out war. i spoke to the secretary of defense, ash carter. >> secretary carter welcome to the program. >> good to be here. >> on the eve of president trump going to davos, they put out a global survey saying the risk of military conflict is rising and it will sharply rise in 2018. what do you make of that? does that sound right to you? >> the principal place that that may be true is on the korean peninsula, elsewhere there's danger, but it may be a continuation of the past. we may see -- it's not highly probable, but never rule it out, is an incident