[madaxe]

OpenStreetMap have pretty good data, actually, not just for Belarus, but also all sorts of areas in the ex-USSR where google/apple/nokia can only manage a blank space, or a 1 point per 10km vector road. Saved my bacon repeatedly while rallying across that neck of the woods, and you can very easily load OSM data into a garmin or whatever.

Edit: looks like google have been making lots of headway in this area too - https://www.google.com/maps/preview#!q=rostov+on+don&data=!4... - this time last year, there was only one road in Rostov, according to them, and it was dead straight. Made navigating fun, as I failed to get the OSM tile for the area, as it was an unplanned side-trip.