Rubuta ci gaba don wannan sakin layi - A yayin gabatar da siyasar jam'iyyu da yawa, Poungui ya yi murabus daga PCT a ranar 28 ga Nuwamba 1990 kuma ya zama shugaban wata sabuwar jam'iyya, Union for Social Progress and Democracy (UPSD). A ƙarshen yakin basasa na Yuni-Oktoba 1997
, wanda shugaban PCT Denis Sassou Nguesso ya koma mulki, Poungui, a matsayin mai goyon bayan Shugaba Pascal Lissouba, ya gudu zuwa gudun hijira. Ya kasance a gudun hijira har zuwa 2006.