Of course, no one except maybe Trump and his base think this is a step towards peace. It may actually be a step closer to war. If North Korea breaks the deal, some people in the Trump administration (Bolton or Pence) may use it as a justification for a preemptive strike.

The comment about the Iran deal is also correct. This sends a message that the US won't give adversarial countries a favorable deal unless they already have nuclear weapons.