Oh please.Your choice of the word "idiot" is appropriate, but not in the way you think it is.
Real men, real leaders, and the Presidents of global super powers do not bluster on Twitter, do not issue threats on twitter, and do not berate and harangue allies on twitter. Even uber-conservative Ted Cruz is criticizing the way your Orange Clown is blustering.
We have diplomatic channels to do shit like that. Once you start blustering and bellowing on Twitter, you are going to be committed and you open yourself up to being weakling that makes empty threats. Speak softly and carry a big stick. Teddy Roosevelt, no?
I actually can't even remember the last time Putin threatened to annihilate a country on Twitter. But we both know Putin is about ten times more cunning than your hapless, flaccid, orange clown.
Trump is telling lil Kim the days of "strategic patience" by the Obama administration is over.
We are NOT going to have to "just live " with a nuclear NK -despite Susan Rice's counsel to do so.
Trump's tweets are enough to convey the fact that time is running out for China, or sanctions or whatever alternative is not going to last forever. That's all that matters with NK. They need to know for sure a status quo of lil Kim being an existential threat to us cannot stand forever.
Hopefully China steps up - but if they don't we are going to take our self defense in our own hands and are not going to put ourselves in a possible demise posture for anyone.

Surely Trump could have easily just blustered Iran into a better deal .. given how well that bullshit is working for him on North Korea .. red lines and such. :0)