Russia may resume nuclear tests in response to such actions by US -- security official / More powerful than Hiroshima: how the largest ever US nuclear weapons test built a nation of leaders in the Marshall Islands. / Russia weighs starting nuclear testing amid tensions with US / US must not resume nuclear testing, compete with China, Russia -- expert / World's first nuclear test contaminated US area of 2,600 square kilometers -- archives / Allies of Donald Trump are pushing for the first nuclear tests in three decades / Far North man gets medal for witnessing nuclear bomb tests, 67 years after the event / Top prosecutors back compensation for those sickened by US nuclear weapons testing