Satellite images have shown a "high level of activity" at North Korea's key nuclear facility, a U. The images taken in March suggest that completion of an experimental light water reactor at the nuclear complex in Yongbyon is just around the corner, Washington-based website 38 North, a group monitoring North Korea, said Saturday. says North Korea sought to sell over 20 types of arms to RussiaNorth Korea says it tested new underwater nuclear attack drone