Final answer:
Lev Koleshov is not a well-known figure in history, but Lev Gumilev is a notable Soviet historian known for his work on the history of the Khazars and his neo-Eurasianist beliefs.
Step-by-step explanation:
Lev Koleshov is not a prominent figure in history, and there is limited information available about him. The information provided in the question refers to Lev Gumilev, a Soviet historian, anthropologist, and translator. Lev Gumilev was known for his work on the history of the Khazars and other people of the Central Asian steppes. He was also a neo-Eurasianist who believed that Russian identity was more closely related to the peoples of Central Asia than to Europeans. However, it's important to note that this information may not be directly related to Lev Koleshov.