Dr. Terence Roehrig, Professor of National Security Affairs, the Director of the Asia-Pacific Studies Group US Naval War College gave a special lecture at GSIS on May 13, 2015. Professor Roehrig talked about the US Nuclear Umbrella and South Korea, elaborating on the extended deterrence and use of the Nuclear Weapons. Roehrig started by affirming the strong alliance between the US and the Republic of Korea adding the strong credibility of the defense commitment of the US. Yet, he doubted the likelihood of the US actually using nuclear weapons against North Korea, though not disregarding the possibility altogether. The importance of dialogue with North Korea was also emphasized along these lines.