others pursue their, quote, reckless, hostile policy toward north korea." kim declaring his nuclear program is at full speed. the nuclear complex at nong bee ong is operating normally. a u.s. official tells cnn they have no reason to doubt the claim and analysts take the threat seriously. >> if you look here, the snow melt in this area. snow melt again on the reactor. this would indicate that the reactor is functioning, it's giving off heat causing that snow melt. also here in august, you can see tracks leading into the reactor area. that again shows that there's significant activity going on at these sites. >> reporter: kim's said to be obsessed with developing nuclear weapons as his father and grandfather were. his grandfather kim il sung founder of the country saw the united states bring imperial japan down to its knees with nuclear weapons. this is a regime that's been