On June 23, 2022, Thursday, from 1 p.m., United Nations Command Deputy Commander Lieutenant General Andrew Harrison visited the Sejong Institute and held a meeting on the topic of "the new Korean government's unification policy, North Korea's nuclear issue, and Kim Jong-un's nuclear doctrine." Chariman Moon Chung-in of the Sejong Institute, President Lee Sang Hyun of the Sejong Institute, United Nations Command Deputy Commander Lieutenant General Andrew Harrison​, Lieutenant Colonel Oliver Mikulskis, and Captain Angus Caddick attended the meeting. United Nations Command Deputy Commander Lieutenant General Andrew Harrison​ has served in the Republic of Korea several times.