Japan is Working on Their Theatre Missile Defense

And, yes, this is about China. KJI seems almost anxious to get rid of his nuclear weapons, and ballistic missiles really aren't that useful for anything else: Other WMDs are crapshoots at best with chemicals or bioweapons standing a real chance of ending up blowing back to the Korean Peninsula, and you don't mount conventional weapons on ballistic missiles.

China, on the other hand, has a fair number of nuclear missiles, has been a wee bit belligerent to Japan in the past, and is very, very interested in Taiwan- a country that could easily be put under a Japanese BMD shield. Not that anybody will say anything concrete to that effect. They'd be idiots to do so. But just keep it in mind.