well sc1ro....
http://www.google.be/ long time ago i saw you just wanted to reply

Hello!
If you buy a car in France, you have to make a "carte grise" (litteraly grey card), at the prefecture, to report the purchase of your car and to be allowed to drive it (it proves you own the car), and a "plaque d'immatriculation" (license plate for your car). If the prices aren't including all taxes, you have to add the T.V.A. (V.A.T.) (x1.196), but normally every prices including all taxes. There is various other taxes: on fuel, VAT on insurance, registration fees, royalties paid by road users and road tolls. You have to pass the technical control and the pollution control too every 5 years (~50€).
According to the price and the power of your car, your car has a "puissance fiscale" (litteraly horse tax, fiscal power), which does the price of your "carte grise" (the prices begins at 300€, something like that, for an old bad car for example).

www.hertz.fr
www.avis.fr

They rent cars, and have their website in english too. You can find all you need there.

I'm affraid it's impossible if you dont live in France or if it's not for export. On every car papers your address is written, so you absolutly have to have one, (it might work with a friend's address but it will be more administrative requests, and believe me the less you have to do the better it is for you. It's already annoying and long for a french so I can't imagine for a russian, so few people speak english here even less russian).

You also might have a problem with insurance, dunno if a russian's insurance is available in France, if not then you also need an address for it.

If you have an adress here, then between 150 and 400 euros for registration certificate, MOT is 70 euros, license plate 20 euros, insurance depends on car and if you want full or part insurance I would say from 200 euros to 1000 per year.

Honestly it's gonna be a pain in the ass for you to get all administrative papers needed. I doubt it's worth it if you have planned to come less than 3 months. If I were you I would go for a rental car.