I think the Hebrew word "Rosh" means the Hebrew word "Rosh", which in turn means "head", as in Rosh Hashanah (Happy New Year).
Not to mention that the Russians have been at war against Muslim invaders for over 1,000 years (hint: the Mongols were Muslim after converting in 1260) and anyone who thinks Russia would have a civilizational alliance with the Muslims is proving that he or she literally knows nothing of Russian history.
You'll have to argue with the people who studied this and came to the conclusions they did about the origins of the nations listed in Ezekiel 38.
I really don't care about Russian history- I just care about Russia to the extent that they are in the process of doing just what God said they would and to the extent that they are stupidly walking into an extermination, courtesy of the God of Israel.
Other than that, I couldn't care less about Russian history.
They had an alliance with Hitler, did they not? Alliances can be less than permanent things. The Russians are big believers in "The Enemy of my Enemy is my Friend", temporarily at least.