One thing I can think about America, it is guided by the idealism of spreading capitalistic democracy everywhere.
The last big upheaval in mankind was the move to communism in regard to world economy in commerce, and authoritarian government in politics.
That big movement has proven untenable to attain a good life for mankind, and has been abandoned worldwide, except for some packets of mankind who are still pursuing that idealistic dream, by violence, examples of which is North Korea, and also the on a very small scale the communist rebellion still ongoing in the Philippines.
So, my thinking is that the US should just leave Kim Jong-un to his toying with missiles and nuclear explosives, because he cannot hit US territory what with the kinds and quantities of defense perimeters of the US.
And the US now led by one Trump should concentrate with loving the North Korean people to 'death', by showering them with such things as all sorts of home goodies, in the rural districts of North Korea; and together with the home goodies, the message to abandon Kim and get aligned with America, because nations now aligned with America, they are having a good life for their peoples, e.g., Germany, Japan, South Korea.
But sad to say, Trump is playing his toy of itching to fire up US nuclear explosives, and he has found a good place to do that, in North Korea.
So, the rest of world leaders should talk sense to him, just as world leaders tried to talk sense to Bush junior to not invade Iraq out of pique for seeing the US Twin Towers destroyed by Islamic fanatics of the Al Qaeda streak, and now we see how the US is into more deaths to its young folks with its war activities in Iraq and peripheral nations around Iraq.