A Yono class submarine is thought to have fired the torpedo attack which sank a South Korean Pohang-class corvette, the ROKS Cheonan on March 26, 2010 in South Korean waters [REF].
A member of the North Korean cabinet who defected to South Korea in 2011, said on 7 December 2012 that the crew of the North Korean submarine which sank Cheonan had been honored by the North Korean military and government.