I understand why the Japanese would not want to have nukes used on them. I was merely stating that they would "encourage" the US not to do whatever the NK didn't like, rather than risk it. A very reasonable attitude, I think- but it does remove some of the air threat we could bring to bear.
Yes, we have. I hope we will continue. BUT, if NK decides to act foolishly, remember it only takes one side to start a war. Of course, we could always just surrender.