Rubuta ci gaba don wannan sakin layi - Bayan dawowar Shugaba Denis Sassou Nguesso zuwa mulki a yakin basasa na Yuni-Oktoba 1997
, an gudanar da taron sulhu na kasa a watan Janairun 1998; a karshen taron, an zabi Koumba a matsayin shugaban majalisar rikon kwarya ta kasa (CNT), kungiya mai mambobi 75 da za ta yi aiki a matsayin majalisar na wucin gadi, a ranar 14 ga Janairun 1998. Kodayake Koumba dan kudu ne, CNT ya fi yawan 'yan arewa, daidai da mulkin siyasa na' yan arewa a karkashin Sassou Nguesso. Jikin, wanda ya kasance daga 1998 zuwa 2002, an nuna shi a matsayin "hatimi na roba mai banƙyama".