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Choi Kang, Victor Cha
4092026.02.27
For the past seven decades, the United States’ extended deterrence commitment to the Republic of Korea (ROK) has been critical to advancing two central aims of the alliance: (1) deterring North Korean aggression and (2) preventing nuclear proliferation by giving South Korea a credible alternative to developing its own nuclear arsenal. Today, however, a shifting geopolitical environment has introduced new areas of uncertainty into the alliance.
The Asan Institute for Policy Studies and CSIS engaged in a joint project from late 2025 to early 2026, including a full-day workshop to assess extended nuclear deterrence cooperation within the U.S.-ROK alliance. The select group of experts and former officials discussed the credibility of U.S. extended deterrence commitments and brainstormed ways to strengthen these commitments amid heightened uncertainty and evolving security challenges in the region.
The key observations and recommendations of the project recorded in this report do not necessarily reflect the views of every participant in the study, or the positions of either organization.
This report was made possible through the support of CSIS and the Asan Institute.
President
Dr. CHOI Kang is the President at the Asan Institute for Policy Studies. Previously, he was the dean of Planning and Assessment at the Korean National Diplomatic Academy. In 2012, Dr. Choi served as the president at the Institute of Foreign Affairs and National Security (IFANS). He was also a professor and director general for American Studies at IFANS, a research fellow at the Korea Institute for Defense Analyses, and senior director for Policy Planning and Coordination on the National Security Council Secretariat. He holds several advisory board memberships including: the Committee on Foreign Affairs, Trade, and Unification of the National Assembly; Ministry of National Defense; Ministry of Unification; Air Force Development Committee; and the National Unification Advisory Council. Dr. Choi was also a South Korean delegate to the Four-Party Talks. He writes extensively on the ROK-US alliance, North Korean military affairs, inter-Korean relations, crisis management, and multilateral security cooperation. Dr. Choi received his B.A. from Kyunghee University, M.A. from the University of Wisconsin-Madison, and his Ph.D. in political science from Ohio State University.
view moreVictor Cha is president of the Geopolitics and Foreign Policy Department and Korea chair at the Center for Strategic and International Studies (CSIS). He is also a distinguished university professor and professor of government at Georgetown University. From 2021 to 2025, he was appointed by the Biden administration to serve on the Defense Policy Board in an advisory role to the secretary of defense. From 2004 to 2007, he served on the National Security Council (NSC), where he was responsible for Japan, Korea, Australia, New Zealand, and Pacific Island nations. Dr. Cha was the U.S. deputy head of delegation at the Six Party Talks and received two outstanding service commendations during his tenure at the NSC.