In statement issued on Sunday, the Policy Department of North Korea's National Defense Commission repeated its proposal to carry out a joint probe into the Cheonan sinking; the first such proposal was made in July 2010, three months after the incident took place.
"If there is a basis to believe that the sinking was our doing, [South Korea] should accept our proposal to jointly investigate the incident in front of all our people and the world," the Policy Department said.
It added that "establishing the truth will be even easier" given that the Cheonan corvette was brought to the surface a month after the sinking.
According to the Policy Department, a relevant "inspection team" within North Korea's National Defense Commission has already been formed.
Two months after the Cheonan sinking, the South Korean government slapped a series of sanctions on Pyongyang, breaking almost all economic ties, except those related to a joint industrial zone in Kaesong in North Korea.