[altair]

I'm afraid. North Korea has already launched one missile over Japan. Then there was that matter of the North Korean mystery boat that was sunk in Japanese territorial waters a couple of weeks ago. North Korea doesn't need nukes to threaten Japan, they already have with conventional weapons.

[hchutch]

Most likely, we have deployed tactical nukes to Japan. I would nto be surprised to see Japan develop their own nuclear arsenal in the next 10 to 15 years, though.