Kammala wannan jumla: Bayan dawowar Shugaba Denis Sassou Nguesso zuwa mulki a cikin
Yuni-Oktoba 1997 yakin basasa, an gudanar da Taron Sulhu na Kasa a watan Janairun 1998; a karshen taron, an zabi Koumba a matsayin Shugaban Majalisar Zartarwa ta Kasa (CNT), kungiyar mambobi 75 da za ta yi aiki a matsayin majalisar wucin gadi, a ranar 14 ga Janairu 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".