So far as the "small indigenous peoples of the North" strictly defined are concerned (which does not include Yakuts)
https://en.wikipedia.org/wiki/Indig...eoples_of_the_North,_Siberia_and_the_Far_East this is the highest-ranking politician I could find--and he wasn't really very high-ranking--from the 1979
Great Soviet Encyclopedia:
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Uvachan, Vasilii Nikolaevich
Born Dec. 12 (25), 1917, in the nomad camp of Kresty, now in Katangskii Raion, Irkutsk Oblast. Soviet historian and party and state figure. Doctor of historical sciences (1970). Professor (1974). Member of the CPSU since 1940.
The son of an Evenki hunter, Uvachan graduated from the technicum of the Leningrad Institute of the Peoples of the North in 1937, from the Higher Party School Under the Central Committee of the ACP(B) in 1948, and from the Academy of Social Sciences of the Central Committee of the CPSU in 1954. In 1934 and 1935 he was involved in Komsomol work. From 1942 to 1946 he was a secretary of the Evenki Regional Committee of the CPSU, and from 1948 to 1951 and from 1961 to 1976 first secretary. From 1954 to 1961, Uvachan taught in Novosibirsk and Krasnoiarsk. In 1966 he became a member of the Central Auditing Commission of the CPSU, and in 1974 he became a committee member of the Parliamentary Group of the USSR. Since 1976 he has been with the Central Administration of the Council of Ministers of the RSFSR. His main works are devoted to the history of the peoples of the north and to problems connected with policies concerning the country’s numerous nationalities and with relations between nationalities.
Uvachan was a deputy to the third and sixth through ninth convocations of the Supreme Soviet of the USSR. He was awarded the Order of Lenin, the Order of the October Revolution, two other orders, and various medals.
https://encyclopedia2.thefreedictionary.com/Uvachan,+Vasilii+Nikolaevich
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I just don't see him leading the USSR. (BTW, his
The Peoples of the North and Their Road to Socialism is available online at
https://archive.org/details/ThePeoplesOfTheNorthAndTheirRoadToSocialism/page/n1)
Given their small numbers, it is not surprising that so few figures from these peoples have gone very high in the leadership of the CPSU. It would be like expecting a Tlingit to be a serious candidate for President of the United States--though, come to think of it, one did become Lieutenant Governor of Alaska!
https://en.wikipedia.org/wiki/Byron_Mallott