Major power rivalries have been intensifying in the once dormant arena of territorial claims in both East Asia and Europe; and in new arenas, the cyber sphere and outer space (and in managing terrorism). Do these developments change the proliferation calculus for countries in the Asia-Pacific? Does nuclear deterrence have a role to play in helping manage these arenas of competition and tension? Or are current trends in relations between great powers hastening the erosion of the relevance of nuclear weapons? In this session, experts on East Asian relations from the United States, China, Japan, and Korea gather to share their analyses and views to answer these questions.