And fresh movements captured in a sensitive place at a sensitive time amid the ongoing diplomacy push with North Korea. Satellite imagery taken last month suggests North Korea may have started testing of an experimental light water reactor-- and possibly brought another reactor online at its Yongbyon Nuclear Research Center. Both can be used to produce the fissile materials needed for nuclear bombs. And according to a recent analysis in Jane's Intelligence Review, a monthly journal on global security issues,... a testing program is underway at the experimental reactor,... meaning it could become operational with little warning later this year or in 2019.