Over the recent years, multiple Muslim countries are involved in geopolitical crises and disputes. The strengthening of Islamic Salafist fundamentalism and extremism, which is a threat to the world, manifests as one of the most discussed and studied problems. Special relevance this question gained after the events known as the “Arab Spring”. Extremist groups that attempted to implement their own administrative model were able to seize the power in a number of countries of Near East and North Africa due to the weakness of political regimes. One of such groups is the prohibited in Russia terrorist organization “The Islamic State of Iraq and the Levant” (ISIS), which emergence was influences by both, internal and external factors. The scientific novelty consists in a comprehensive analysis of various external and internal aspects that contributed to creation of ISIS. The author meticulously examines the extremist ideas based on the Salafist way of thinking, as well as acknowledges the widespread in Saudi Arabia irrationality, economic issues and impact of countries outside the region as the key factors contributing to establishment of “The Islamic State of Iraq and the Levant”. The paper also analyzes the role of financial and logistical support of the United States, presence of regional allies, primarily Saudi Arabia, which are viewed as the external stimuli of the emergence of ISIS.