by Kyle Mizokami
Japan could invest in a small arsenal of land-based missiles, each carrying one or more nuclear warheads. The missiles could be stationed in hardened silos, like the American Minuteman III, or on mobile launchers like the Russian RS-24 Yars. A Japanese ICBM would be smaller, not needing the range and fuel to reach North America. The ability to reach all of China, European Russia and the Middle East would be sufficient.
http://nationalinterest.org/blog/the-buzz/china-north-koreas-greatest-fear-japan-armed-lots-nuclear-19304