For citizens of the CIS countries the visa is not required!
On borders of CIS countries with the passport control the main requirement is the remaining period of the passport's validity should not be less than half a year.
All foreign nationals are required to have entry visas to travel to the Russian Federation. Russian entry visas can be obtained at local Russian Embassy or Consulate, proper authorization (invitation) from the Passport and Visa Department (UVIR) of the Ministry of Internal Affairs or specially authorized travel agencies is required. More on Russian visa requirements.
Please familiarize with procedure of issuing and extending Russian visas at a site http://www.fms.gov.ru/useful/novisas/index_eng.php
Attention! On arrival you should follow the Russian migration legislation. Please familiarize with procedure of Migration registration of foreign citizens in the Russian Federation at a site http://www.fms.gov.ru/government_services/migrate/index_eng.php.
We recommend making visas with leeway.