Excellent, now we are going in the right direction, since all the scientifically established facts about the origin of Ashkenazi Jews, in the linguistic and genetic sense, point to that very region around the eastern coast of the Black Sea, the north of Turkey, the Caucasus and the west of Iran. The most important thing is that it has been irrefutably established that their origin has nothing to do with the ancient Jews/Israelites, nor with the area of Palestine. They are genetically closest to Armenians and Georgians, and Yiddish contains elements of Slavic and Turkic languages, as well as German.
Contrary to popular belief, Judaism as a religion throughout history has never been exclusively related to ethnicity, and proselytism and conversion have always been present. Back in the third century, the famous Christian theologian Origen wrote:
The noun Ioudaios is not the name of an ethnos, but of a choice. For if there be someone not from the nation of the Jews, a gentile, who accepts the ways of the Jews and becomes a proselyte, this person would properly be called a Ioudaios.
That’s how the Ashkenazi Jews at one point in history accepted Judaism as a religion somewhere in the above-mentioned areas, and then slowly reached Poland, Hungary and Germany through Russia and Ukraine…