That's one explanation for Day 3 of provocation from North Korea, which again fired short-range missiles or rockets into the ocean. So far, the medium-range North Korea missiles that caused a flap in April are nowhere to be seen.
While all things in North Korea are cloaked in secrecy, it appears that this new reactor could produce material for nuclear weapons – potentially expanding North Korea's small stockpile.
One of North Korea's more worrisome threats this week was to restart its plutonium production reactor at Yongbyon. Satellite photos suggest the rebuilding has already begun.
Washington’s snap reaction to the North Korean missile launch failure contained decidedly mixed emotions, including relief and concern about what the regime might try next.
A US destroyer forced back a North Korean freighter ship that was possibly on its way through the South China Sea to Burma (Myanmar) with military cargo. It is not clear if the cargo was nuclear or conventional weaponry.
The power to operate cooling pumps, a challenge at the heart of the Japan nuclear crisis, is on the verge of being restored, and a detailed assessment by a US expert is notably upbeat.