While there are currently no known plans in Japan to produce nuclear weapons, it has been argued Japan has the technology, raw materials, and the capital to produce nuclear weapons within one year if necessary, and many analysts consider it a de facto nuclear state for this reason. Also, Japan can produce so called dirty bombs in much less time.

Remember, Japan has 54 nuclear power reactors which all produce nuclear materials. I am sure there are countries around would want to see nuclear free Japan. Because of FUKUSHIMA, many people in Japan also wanted to see nuclear free Japan. But if you think nuclear power plants as deterrent ... I am not so sure.