Prime Minister Kim Boo-kyum speaks at the national cemetery in Daejeon, on March 25, 2022, during a ceremony to mark a commemoration day for 55 troops who died in three major clashes with North Korea in the West Sea, comprising an inter-Korean naval skirmish in 2002, North Korea's torpedo attack on the corvette Cheonan in 2010 and its shelling of the border island of Yeonpyeong in the same year.