Hmmmm, the thing is that as far as the USA acting as the World's policeman, NK has never let up on the USA for siding with the South and when it feels "strong" enough with enough firepower they will launch missiles at the USA come what may.

It might be said that Kim Jong-Un is a deluded madman spurred on by his milatary top brass but he's playing a clever game of strategy and brinkmanship. He doesn't have to do anything (yet) to extract more and more concessions from everyone while he carries on regardless with his nuclear programme. He'll agree to do all sorts of things and as before, just carry on anyway.

The way he's looking at things is that dictators can only go so far before someone with greater firepower topples them so he needs nuclear weapons to ensure that he won't be attacked/toppled because he's gambling that no-one would risk him using those weapons in retalliation for any such attack.

The thing is, we know he has some form of nuclear capability, what he doesn't have (yet) is a means of delivery. He's trying to develop such a delivery system and we don't know (yet) whether those delivery systems for his conventional weapons (missiles) are combat-ready or will actually work. For all we know, all those big missiles on show might just be dummies.

He's got loads and loads of artillery all aimed at the South and should he be attacked (by anyone) he'll open up with all those quite quickly.

In the past, he's been aided by China and if it wasn't for them (the Chinese) the North wouldn't have ended up where they are today after the Korean war.

It seems that he feels strong enough now to go it alone without Chinese backing.

Now, who'd put money on the USA sitting back, puffing out cheeks, doing a bit of pontificating but doing nothing of substance and allowing Kim Jong-Un to just carry on with his nuclear programme?