Sounds like my kind of book. This one is going on my wish list to get.
Alexei Volkovoy--known to the underworld as Volk--is a hardened veteran of the conflict in Chechnya, a gun-for-hire now living in a lawless Russia, serving two corrupt masters: one is Maxim, a psychotic Azeri mafia kingpin, the other a mystery man known only as "The General." When Volk and his lover, a wild-eyed, white-haired young Russian named Valya, are hired by both men to steal the same lost painting from the Hermitage Museum, Volk must choose which to betray, and what that betrayal will cost him. His decision will lead this honest thief into the dark heart of the new Russian oligarchy, where only cash and violence can open doors.