"Don't work" doesn't say much. I'd provide more info.
dbcs are locale specific.
I'd suppose the best thing to do would be just extracting them from a russian client. Open all MPQs in Data/ruRU/ directory in Merged mode in MPQ editor (by using Open MPQs with options... in File menu of MPQ editor) and just extract DBCs from there.If you need to "convert" already modified nonrussian DBC to a russian versions... Nah, hopefully someone around knows a trick how to do that, I sadly can't help you with that very much. You may use conversion to CSV and then transfer data from one DBC to another one by some simple scirpt, but there simply must be a better way.