Gennady E. Afanasiev and his co-authors published the Russian article "Khazarskie konfederaty v Basseyne Dona" in Yestestvennonauchnie metodi issledovaniya i paradigma sovremennoy arkheologii: Materiali Vserossiyskoy nauchnoy koferentsii, Moskva, Institut arkheologii Rossiyskoy akademii nauk, 8-11 dekabrya 2015 in 2015 on pages 146-153. They examined the uniparental markers of 4 individuals in the Saltovo-Mayaki culture of Khazaria who lived circa the 800s:
•Sample A80301 belonged to the Y-DNA haplogroup R1a1a1b2a (R-Z94) which is of Persian/West Asian origin and found today among Turkic-speaking Karachay people. A80301's mtDNA haplogroup was I4a which is found today in northwestern and central Europe such as in Sweden, and also found around the Black Sea, in the North Caucasus, and in Armenia, Iran, and Siberia.
•Sample A80302's mtDNA haplogroup was D4m2, which is found today in Siberia among the Dolgan, Yakut, and Even peoples, but is never found among Ashkenazim.
•Sample A80410 belonged to the Y-DNA haplogroup G, commonly found among peoples in West Asia and the Caucasus today.
•Sample A80411 belonged to the Y-DNA haplogroup J2a, which is also commonly found in West Asia and the Caucasus today, and also in Central Asia and in parts of Europe like the Balkans.
Anatole A. Klyosov and Tatiana Faleeva's article "Excavated DNA from Two Khazar Burials" in Advances in Anthropology 7 (2017) on pages 17-21 examines the Y-DNA STRs of two Khazar samples from the lower Don region of southern Russia. Both of them belong to haplogroups within R1a's subclade Z93's Turkic branches, not part of the Ashkenazic Jewish or North Slavic lineages of R1a. The authors write that "R1a-Z93 is very common in present-day Turkic-speaking peoples such as Caucasian Karachaevo-Balkars, also Tatars, Bashkirs, Kirgiz, and other populations who apparently descended from Scythians, and have their common ancestors in the R1a-Z93 subclade dated back to 1500-2500 years ago".
Tatiana V. Tatarinova and her co-authors (including Khazaria.com's contributing writer Vladimir Klyuchnikov) have a forthcoming paper titled "Diverse genetic origins of medieval steppe nomad conquerors". They released the preprint version on December 16, 2019 to BioRxiv. The final version will be published at Nature.com.
They examined the autosomal DNA and the uniparental markers of 9 ethnic upper-class Khazars (8 men, 1 woman) from 5 medieval Khazarian archaeological sites in Rostov Oblast's southern Russian steppelands. Their bones were provided for the research by the archaeologist Klyuchnikov and his colleague Elena Batieva. They had been buried near the Don river during the 8th-10th centuries,
Supplementary Table S3 and the "Y-chromosome analysis" section reveal the following data:
•Sample 67 belonged to the mtDNA haplogroup D4e5 which is common in today's East Asia and also found in North Asia and Southeast Asia and among Amerindians. D4e5 is never found among Ashkenazim.
•Sample 166 belonged to the mtDNA haplogroup C4 which is a Eurasian/Far Eastern haplogroup. C4 is never found among Ashkenazim.
•Sample 531 belonged to the mtDNA haplogroup X2e which is common in modern Turkey and the United Kingdom.
•Sample 619 belonged to the Y-DNA haplogroup Q and the mtDNA haplogroup H1a3 which the authors suggest might indicate a connection to Southwest Asia.
•Sample 656 belonged to the Y-DNA haplogroup C3 and the mtDNA haplogroup C4a1 which is a Eurasian/Far Eastern haplogroup. C3 and C4a1 are never found among Ashkenazim.
•Sample 1251 belonged to the Y-DNA haplogroup R1a and the mtDNA haplogroup H5b which is currently common in southwestern Eurasia and the Caucasus. H5b is never found among Ashkenazim.
•Sample 1564 belonged to the mtDNA haplogroup H13c1 which is found among modern Europeans. The DNA study's authors don't mention the fact that H13c1 is also found among Armenians from Turkey. H13c1 is never found among Ashkenazim.
•Sample 1566 belonged to the mtDNA haplogroup D4b1a1a which is common in Northeast Asia. D4b1a1a is never found among Ashkenazim.
•Sample 1986 belonged to the Y-DNA haplogroup R1a and the mtDNA haplogroup C4a1c which is a Eurasian/Far Eastern haplogroup. C4a1c is never found among Ashkenazim.
Looking at their complete genomes, utilizing full genome NGS sequencing and interpreting this with reAdmix and GPS tools, they write that samples 67, 166, 1566, and 1686 have strong Asian (in the sense of Mongoloid) autosomal elements, with 166 and 1566 described as "purely Siberian", while samples 619 and 656 are highly mixed between Asian and European elements, and samples 531, 1251, and 1564 are primarily European but also carry minority Asian admixture. Their European elements were mostly from Eastern Europe. They also write that some of their skulls racially had Mongoloid morphologies while others had Caucasoid morphologies.
Tatarinova and her co-authors, with Igor V. Kornienko as the lead author, had their article "Y-Chromosome Haplogroup Diversity in Khazar Burials from Southern Russia" peer-reviewed and published in the April 2021 issue of Russian Journal of Genetics (vol. 57, no. 4) on pages 477-488. This is about those 9 upper-class ethnic Khazars from burial mounds in the Rostov region from the 7th-9th centuries. It discusses Y-DNA evidence mainly, and some autosomal DNA results, but not the samples' mtDNA results. According to this article, their Y-DNA haplogroups were R1a in 3 of them, C2b (not C3) in 2 of them, G2a in one of them, N1a in one of them, Q in one of them, and R1b in one of them. The Abstract observes that "Such results were noteworthy for the mixture of West Eurasian and East Asian paternal lineages in these samples. The Y-chromosome data are consistent with the results of the craniological study and genome-wide analysis of the same individuals in showing mixed genetic origins for the early medieval Khazar nobility."