The Iranian revolution is at a do-or-die moment, requiring western governments to give their full, active support or risk seeing the movement’s impact wane, Reza Pahlavi, the oldest son of the former Shah of Iran who was deposed in 1979, has said in a Guardian interview. Pahlavi said there were signs that if the west imposed maximum pressure, the Islamic Revolutionary Guards Corps (IRGC) and some reformist politicians would desert the regime.