South Korean president Moon Jae-in (L) waves next to North Korean leader Kim Jong-un (R) from a vehicle during the third Inter-Korean summit in Pyongyang, North Korea on September 18, 2018.  Kim has agreed to shut down one of North Korea’s main missile testing and launch sites and will allow weapons inspectors to monitor the process. Both leaders also pledged to bid as co-hosts of the 2032 Summer Olympics. The one caveat to the agreement is that Kim has demanded that the US offer a reciprocal gesture before dismantling his nuclear arsenal, a prospect that is likely to alarm the US State and Defense departments, both of whom are wary of President Donald J. Trump’s previous tirades over American defense spending on the Korean Peninsula as well as his reported inability to understand the role that the US plays in guaranteeing security for both South Korea and Japan.