FYI, I don't think your evidence is as persuasive as you think. I don't believe any one can conclusively prove or disprove Russia is Rosh. Below is a quote for a scholarly publication which disagrees with your source.
"The most impressive evidence in favor of taking Rosh as a proper name is simply that this translation is the most accurate. G. A. Cooke, a Hebrew scholar, translates Ezekiel 38:2, “the chief of Rosh, Meshech and Tubal.” He calls this “the most natural way of rendering the Hebrew.”