The doctrine was also applied by the Nixon administration in the Persian Gulf region, with military aid to Iran and Saudi Arabia, so that these U.S. allies could undertake the responsibility of ensuring peace and stability in the region. According to Michael Klare, author of "Blood and Oil: The Dangers and Consequences of America's Growing Petroleum Dependency" (New York: Henry Holt, 2004), application of the Nixon Doctrine "opened the floodgates" of U.S. military aid to allies in the Persian Gulf, and helped set the stage for the Carter Doctrine and for the subsequent direct U.S. military involvement of the Gulf War and the Iraq War.