 In 1926, Andreev traveled to Afghanistan as a senior dragoman of the Soviet-Afghan commission of the Middle Eastern department of the USSR People's Commissariat of Internal Affairs, using his stay in the country to collect information on the language and everyday life of Tajiks in the Panjshir Valley.In 1927, Andreev led an expedition to Yaghnob, and in 1929, he led one to theKhuf Valley.On January 31, 1929, Andreev, per the recommendation of prominent Soviet orientalists and academicians S. F. Oldenburg, V. V. Bartold, F. I. Sherbatsky and I. Y. Krachovsky, was elected a corresponding member of the USSR Academy of Sciences Department of Humanities (in the category of Oriental Sciences (Iranian studies)).