Following the embargo by Arab oil exporters during the Israeli-Arab October 1973 War and the vast increase in petroleum export revenue that followed, the international propagation of Salafism and Wahhabism within Sunni Islam favored by the conservative oil-exporting Kingdom of Saudi Arabia and other Gulf monarchies achieved a "preeminent position of strength in the global expression of Islam." The Saudi interpretation of Islam not only includes Salafiyya (often referred by outsiders as "Wahhabism") but also Islamist/revivalist Islam, and a "hybrid" of the two interpretations (until 1990s).