 Leading a political party, the Union for Democracy and Social Progress (UDPS), he was then elected to the National Assembly and became the First Vice-President of the National Assembly.Bokamba-Yangouma, who was allied with President Pascal Lissouba, served as President of the Economic and Social Council until Lissouba was ousted at the end of the June–October 1997 civil war.Bokamba-Yangouma fled into exile at the end of the war.