first thing I do is the use that handy data base...bank fraud! lol
so it sounds this. you lended out some bad money (fuck I write bad loans all day long) and he never paid you back but the money was for coke and you cannot go to the cops and he lives far away and you need money back
If I were you (Id burn down my water home I live on first) then I would try to contact someone who may have contacts with the russian mob. I would first start going to the slavic hand job shops (seem to be popular) and see if you can find someone who wiling to bring his ass down. A russian will be the first one to fuck up another russian.
1. you are not getting the money back because he has none of it left
2. change out of your jean shorts with the slot on the side for a hammer
3. try to contact someone who has ties to the russian mob who is dirty