It's surprising to see a man on par with Stalin when it comes to the treatment of his own citizens being defended.
If you are referring to KJU, I don't know who is defending him except his neighbors, Russia and China who also happen to be his trade partners sort of speak, and also would like to see less of the US in Seoul. And they have implied that they will not allow the regime to collapse - whatever that means. On the other hand, the regime was collapsing economically even before the help of the sanctions. But who really knows?? Your guess is as good as mine. One thing for sure, if KN missiles start flying over DC, you bet your booty that there is going to be a war, but other than that, anything is possible.
What will happen if the US bombs Russia? You think Russia will send troops or planes? They will send Katyusha (Kuzkinu mat). Same for China except they will send Ma Fa Ying. I don't know if NK can do the same but if they can they will. In other words: "Don't mess with us."