1/ In 1993 the US and North Korea agreed to support a 1992 joint agreement between NK and SK. I’ve attached the points in that agreement and the points in the Trump/Kim Jong Un agreement for comparison. It’s pretty easy to figure out which is which.
2/ Trump’s toothless agreement along with his offer to end joint military exercises with SK set a disastrous precedent for future negations, and play into China’s and Russia’s hands.