here now is "on assignment" with richard engel. welcome, it's saturday morning in seoul, south korea. i spent a lot of time covering conflicts but one thing i didn't expect to be reporting on is the possibility, remote possibility of a nuclear conflict but here i am and that's what we're doing, talking about rising tensions with a nuclear armed north korea. now, north korea is a small, poor, isolated country with very limited resources, but in my hotel room the other day, i watched vladimir putin, the president of the world's second largest nuclear power make a presentation that included a slide showing a nuclear strike on florida. experts say he may well be bluffing to whip up supporters