The Ashkenazim are certainly of Turkic Mongolian origin, same as the Yakut, and both are horse-riding nomads. The raids of Turkic Mongolians using horses expanded their invasions to the west and south to Rome and India. Collectively, Ashkenazi are less genetically diverse than other Jewish ethnic divisions. The Khazar developed very late in 750 AD compared to Turkic Mongolian raids in 1800 BC.
It is unreasonable to claim that Jews are an ethnic group because Jewishness in fact is a political association that was initiated by Turkic Mongolian but very soon it became a very heterogeneous assembly due to Turkic Mongolian vast raids, excessive slavery of nations, and intensive miscegenation to breed and change their physical appearance to look like Caucasians and Europeans. Let us first give brief definition of the Yakut then show a genetic study on their origin.
Yakuts (Sakha: Саха, Sakha) are a Turkic people who mainly inhabit the Sakha Republic (Yakutia) in North East Asia. The Yakut language belongs to the Siberian branch of the Turkic languages. Yakuts mainly live in the Republic of Sakha in the Russian Federation, with some extending to the Amur, Magadan, Sakhalin regions, and the Taymyr and Evenk Autonomous Districts.
The Yakuts are divided into two basic groups based on geography and economics. Yakuts in the north are historically semi-nomadic hunters, fishermen, reindeer breeders, while southern Yakuts engage in animal husbandry focusing on horses and cattle. Yakuts – Wikipedia
Genetically the Yakuts are a hybrid population, but culturally they are Turkic. This is not a totally exceptional pattern. Ashkenazi Jews and many Latin Americans exhibit the same disjunction between genetic admixture, and relative dominance of particular cultural forms as opposed to synthesis. Part of the issue here is that biological and cultural evolution operate differently, with the latter being far more flexible and unconstrained by the inheritance modes imposed by DNA and sexual reproduction.
The Yakuts also may serve as an example of a particular mode of long distance gene flow which was possible only with the rise of horses. The origins of the Yakuts – Gene Expression
A Resource for Turkic and Jewish History in Russia and Ukraine called Khazaria.com (Khazaria.com, established on May 5, 1995 by Kevin Alan Brook, author of The Jews of Khazaria (1st edition, 1999; 2nd edition, 2006), is the leading Internet provider of information about the Khazar Kingdom.) posted the following article: Special Topic: East/Northeast Asian Admixture in Ashkenazic Jews saying:
Occasionally I get comments from Ashkenazic Jews from Eastern Europe that they or certain members of their families have a few physical characteristics typical of East Asian peoples belonging to the Mongoloid race, such as something Asiatic about their eyes, cheekbones, or hair thickness. There are also some photographs of Ashkenazim where such features are faintly evident, although European and Middle Eastern (West Asian and Southwest Asian) phenotypes prevail in most families.
It turns out there is a genetic basis for a small amount of East Asian and Northeast Asian (East Siberian) ancestry in Ashkenazim, just as there is in some neighbors of Ashkenazim such as non-Jewish Hungarians, Ukrainians, Romanians, and Russians, though the Mongoloid inputs into these populations didn’t always come from the same source populations. Let’s review the evidence we have so far: Here (Note:The genetic testing company 23andMe had updated their methodology or their reference samples and the formerly “Yakut” segments in Ashkenazim were usually reclassified as “Broadly East Asian”.)