High levels of fighting continued for several more years and resulted in thousands of Russian and Chechen casualties and hundreds of thousands of displaced persons. In 2005, Chechen rebel leader, Abdul-Halim Sadulayev, decreed the formation of a Caucasus Front against Russia, among Islamic believers in the North Caucasus, in an attempt to widen Chechnya's conflict with Russia. After his death, his successor, Dokka Umarov, declared continuing jihad to establish an Islamic fundamentalist Caucasus Emirate in the North Caucasus and beyond.