I dont think that it is "russian" format, we have a lot of [different formats for different purposes](http://www.artlebedev.ru/kovodstvo/sections/91/):

In-city numbers: (hypens can be changed with spaces)
- 123-45-67 
- 12-34-56 
- 1-23-45 
- 12-34 

In-city numbers with area code
- (123) 123-45-67 
- (12-34) 12-34-56
- (123-45) 1-23-45 
- (12-34-56) 12-34 

Mobile phone numbers
- +7 123 123-45-67 (preferred) 
- 8 123 123-45-67