This is the same-same people that put some serious hurt on half the world not so long ago. Mess with them at you peril......They have more than some Patriot batteries if you want to push them.
The Japanese have been developing a robust missile defense system.They have a very good AEGIS/SM-3 system that has been growing. They also have been developing a fanstastic missile defense,early warning and reconnaissance satellite system.
Who are you talking about, the Japanese? The last time they got pushy we nuked them.