Madagascar’s Defense Minister, Mamy Ranaivoniarivo, has resigned under duress after a group of the country’s soldiers confronted him in his office. President Marc Ravalomanana has made a plea for the end of the chaos that has beset his country. But large swaths of the country, including the military, supports opposition leader Andry Rajoelina, indicating that Ravalomanana’s future as president may be in doubt.