we watched the north koreans build a small. gas graphite moderated nuclear reactor five megawatt hours since a research reactor it s a small reactor but it produces each year in its fuel about five kilograms or so of paternity of enough material for a single mature weapon each each year. at this time north korea have the technical capability to build me a k. weapons. in one thousand nine hundred eighty five john yang ressa five the new nonproliferation treaty mostly to ease international concern about its weapons program. by the late one nine hundred eighty s. the subject up was collapsing and that meant trouble for moscow s allies including north korea.