The head of a group of 10 ethnic armed organizations that have signed a nationwide truce with the Myanmar government has resigned, citing dissatisfaction with the country’s peace process, one of his colleagues said Wednesday following the team’s two-day meeting in northern Thailand, RFA reported.

General Mutu Say Poe, chairman of the Karen National Union (KNU) and commander-in-chief of its armed wing, the Karen National Liberation Army (KNLA), stepped down from his position as head of the Peace Process Steering Team (PPST), KNU general secretary Tar Do Mu told reporters at a news conference.

Tar Do Mu was selected to replace Mutu Say Poe as one of the PPST’s two top leaders, he said.