South Korea already has a mutual defense treaty with the US: https://en.wikipedia.org/wiki/Mutual_Defense_Treaty_(United_States%E2%80%93South_Korea) https://en.

South Korea already has a mutual defense treaty with the US: https://en.wikipedia.org/wiki/Mutual_Defense_Treaty_(United_States%E2%80%93South_Korea) https://en.wikipedia.org/wiki/Mutual_Defense_Treaty_(United_...