Volga Volga,indeed is a good one. He trained at Yohji Yamamoto my friend told me some time ago....he spends alot of time Japan as well.
My other favourite besides Nina Donis...well,not Russian but Ukranian designer Viktoria Krasnova. I don't know what she's been doing in recent seasons since after posting this thread but I really enjoyed what she's done. There's also that adorable Belarussian label A&V,that I like.