The war began with Iraq's invasion of Iran, in an attempt by Iraq's dictator Saddam Hussein to take advantage of the perceived post-revolutionary military weakness in Iran and the Revolution's unpopularity with Western governments. Much of the top leadership of Iran's once-strong Iranian military had been executed. Saddam sought to expand Iraq's access to the Persian Gulf and the oil reserves in Khuzestan (which also only has a substantial Arab population), and to undermine Iranian Islamic revolutionary attempts to incite the Shi'a majority of his country. Iranians also believe Saddam invaded with the encouragement of the United States, Saudi Arabia and other countries.