To do this you would need to import your car into Russia. This is incredibly expensive and is known to take ages.
If you sell or donate your car in any country without importing it you run the risk of getting stopped on the border or airport. You risk paying fines (in the several thousand $ region), being banned from that country or even getting arrested. We've had Ralliers in 2014, 2015 and 2016 ignore this warning and finish the rally with enormous fines and deportations on their passports. A deportation makes any future visa applications much more complicated so a moment of weakness when you take a lazy way out of a fixable problem, could affect your travel plans for decades.
What's more, the person who ends up driving around in your illegal car could face legal troubles too. It's unlikely that the locals are aware of their own countries laws, even if they seem grateful. We've known of border Guards losing their jobs after helping stranded Ralliers 'sell' cars.
An illegal 'donation' is well-intentioned, but ultimately crap for all parties.
This article written by the UK embassy in Mongolia gives a very good summary of customs taxes. It's written about Mongolia specifically, but we think it's a concise summary of quite a complicated subject. Well worth a look.