Although Iran's population and economy were three times the size of Iraq's, the latter was aided by neighboring Persian Gulf Arab states, as well as the Soviet Bloc and Western countries. The Persian Gulf Arabs and the West wanted to be sure the Islamic revolution did not spread across the Persian Gulf, while the Soviet Union was concerned about the potential threat posed to its rule in central Asia to the north. However, Iran had large amounts of ammunition provided by the United States of America during the Shah's era and the United States illegally smuggled arms to Iran during the 1980s despite Khomeini's anti-Western policy (see Iran–Contra affair).