– US Naval War College Review – Since its provocations against Yeonpyeong Island on 23 November 2010, North Korea’s asymmetric threats have emerged as one of the most momentous security issues for the Republic of Korea (ROK). After bitter defeats in the First and Second Yeonpyeong Sea Battles, as well as in the Daechung Sea Battle of No- vember 2009, North Korea recognized its disadvantage in symmetric surface-ship provocations. It resorted instead to new and unexpected tactics, utilizing its latest small submarine to torpedo ROKS Cheonan on 26 March 2010.