Van Jackson

Kim believes he doesn't need to compromise to get what he wants, doesn't need to conduct serious negotiations at the working level because he has recourse to Trump, and doesn't need to restrain any of his missile testing or actions abroad as long as he doesn't test an intercontinental ballistic missile.

Responding to missile tests by saying 'Let's talk,' is a big, fat moral hazard, it reinforces Kim Jong Un's own perception that the U.S. is desperate for talks.