Although much of your post is at least reasonable, this is not. Trump walked away rather than make a bad deal. Even Pelosi praised him.
We will see if a deal can be made. The previous presidents made deals, but NK did not keep their side. Trump seems to be willing to deal, but wants monitoring. The others made deals and were praised, but now Trump won’t and you say he got suckered. It is just the opposite. The others got suckered. it remains to be seen whether Trump will.
The choice of Viet Nam as the site for dealing was very shrewd. It is a communist country that had been an enemy of the US and is now booming economically with US help, an example of what NK could be. That shows some savvy.