The brochure of the Chairman of the Interdepartmental Scientific Council for the Study of National Processes under the Presidium of the Academy of Sciences of the ArmSSR, Doctor of Historical Sciences, Professor X. A. Barseghyan presented to the readers is devoted to the problem of Nagorno-Karabakh and the events around it. In it, in the light of the materials of the First Congress of People's Deputies of the USSR and the September (1989) Plenum of the Central Committee of the CPSU, which developed the Party Platform on the national issue in modern conditions, the history and historiography of the ICAO problem, in particular the events of 1988-1989. in the region.