With all due respect, just what the hell could NK do to Japan anyway, other than lob a few missles their way?
What I am saying is, by all accounts, "the zips are in the wire." ( as in, domestic terrorism, WMD in Tokyo by suicide agents, that kinda thing) there is a significant fifth column operating already in Japan that could be activated. there are many who are life long residents of Japan and yet are loyal to Pyongyang, operating more or less with impunity, although they are watched by the authorities)... DPRK could also launch a barrage of nodongs and scuds across the Sea of Japan toward Japan, of course Pyongyang would like in ashes about 24 hours later.