Do you have a pic, b/c that is pretty vague. Color? coat texture/length? Size when full grown? I have a book full of breeds and rare breeds but it was pretty hard to go on only that information. I can name some Russian ones off and you can see if it is any of them.
Russian Bear Schnauzer
Russian Laika
Russian Owtcharka
Russian Particolour hound
Russian Sheepdog
Russian Wolfhound
I know the Laika needs plenty of grooming and brushing so that probably is not it. As well as the Russian Sheepdog.
I did what I can to help you figure it out. If you get any more info let me know.