> South Korea and the United States are politically weak right now ...
I don't know where you're getting news about Korea, but since his inauguration on May 2017, Moon Jae-In has been consistently enjoying approval rating of 60-70%. Even his party is enjoying ~50% support, while the chief opposition party (the conservative Liberty Korea Party) is struggling at 10-15% (although they do have 116 out of 293 seats at congress).
I don't know where you're getting news about Korea, but since his inauguration on May 2017, Moon Jae-In has been consistently enjoying approval rating of 60-70%. Even his party is enjoying ~50% support, while the chief opposition party (the conservative Liberty Korea Party) is struggling at 10-15% (although they do have 116 out of 293 seats at congress).
Moon is politically invincible now.