I think the lack of shooting down NK missiles over Japan and the fact NK keeps launching missiles is a wake up call to most in America that they have been duped. Trump, Nickie Hailey, McMaster and the like shot their mouths off and exposed themselves far too early and showed their hands at the start. They didn't expect someone to call them out on their bluff. Examples would be Trump and crews claims of the aircraft carriers headed to NK. In the end, they didn't make it there. Then it was about how they will shoot down NK missiles that they (NK) test, then moved THAAD and SM-3 to Japan. No missiles were shot down since. That was when NK called out US' bluff. Now the next bluff is that "we will destroy NK if they attack our allies" and "we have the capabilities, we just can't say how, on neutralizing NK threat before they can retaliate against South Korea or Japan". We of course know that they don't. In today's age of technology, nothing is secret. And in the end, even with all the Tomahawks and Minutemen that they have to devastate NK, we know, they know, everyone knows NK has a ridiculous amount of hidden bunkers, tunnels and bases underground and its mountainous regions which act as natural protection. We know Iran has underground missile facilities, well it is guaranteed so does NK. In this regard, there is no guarantee the US can strike NK without any blowback from NK towards SKorea and Japan. Because if there wouldn't be, and US was certain, then they would have already done the attack. So that is their latest bluff.
The best part of all of this is that now this becomes obvious to everyone. What US blunder with running their mouth has done is got China and Russia closer, gave NK guarantee that having Nukes is the ultimate decision and that they will not end up like Libya and Iraq by having them, and gave Russia prime realization that the US is a lot weaker than they make themselves out to be. Of course they already knew that before hand, but this time the US has shown it by exposing itself.
The only danger here though is that US may talk itself into a corner (already has) and may lash out and cause a real conflict. But if they do it, it will be against North Korea cause they will hedge their bets against them rather than Russia or China because they know the other two are far better equipped and prepared.
Only trump card the US has left is Ukraine, and that is against Russia. But they know that card is more of a wild card and could work against them too.