Marina Dayachenko, together with her husband, Sergey, form Russia’s powerhouse fantasy fiction duo, though they are actually Ukrainian by birth and also write in their native tongue. They have won a host of awards in Russia, and were voted Best Writers at the 2005 Eurocon. I’m currently looking at Vita Nostra, which Aliette has been enthusing about, and which also has a rave blurb from Lev Grossman. Another of their novels, The Scar, was picked up by Tor in 2012.