Once again, the US as the cosmic Daddy. If we make this a pissing contest the only thing that we'll gain is escalation. I doubt that N. Korea's intent is to start a war. I think they are trying to get someone to shoot down their missile.
So we act in a manner that we know will absolutely lead to escalation? You don't have the right to unilaterally appoint yourself, or anyone else the global police, in fact, pursuing that dead end will gain support for N Korea not lessen it.
Neither you nor I know what anyone else is going to do. If you want to play Miss Cleo that's your affair, but really, I kind of suspect that China isn't going to ignore the people next door. I also suspect that if the US and by default the west, didn't spend the last eight years as it has, we might have a good deal more global support to influence situations such as this.
What do we do? We find some competent diplomats who don't share your run and gun enthusiasm, who know the situation on the ground - which neither you nor I do, and send them to work with everyone else involved - and when and if N. Korea decides to actually commit to acts of war, we can have someone let you know, so you can sign up to go shoot some of them.
I don't know what the hell you're talking about with regards to China and Russia. Nor do I think that whatever that is you're saying is going to benefit by the US becoming involved in it.