North Korea nuclear talks are possible if the North gives up its nuclear program, Secretary of State John Kerry said this weekend. That's not new, but Kerry's tone has worried some analysts.
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.
North Korea said Tuesday it would restart a nuclear reactor capable of making fissile material for bombs. At least one expert sees it as North Korea's 'most worrisome' threat yet.