The biggest "weapons-oriented" publishing house in russia:
http://www.atlant-tpg.ru/sto.html
"Weapons of the ancient east", Gorelik
http://books.j5.ru/tov/orugie-drevne...ie-iv-v-do-n-e
Mongols ... by Gorelik
http://www.neobook.ru/showtov.asp?Cat_id=51476
The first one, ancient east, I've got and you are welcome to borrow it, if you like. Concerning buying them from Russia, I usually just use people I know and ask them to bring book or two on their next visit.