.RU is the ccTLD (country code top level domain) for the Russian Federation. The TLD was introduced April 1994 and it`s administered by the Coordination Center for TLD RU.
.RU is naturally very popular in Russia, with over 4.8 million domain names already registered under the TLD.
A large number of second level domain names under .ru are intended for the use of federal subjects of Russia, or geographic locations; generic widespread ccSLDs are the following:
.ac.ru- higher education
.com.ru- commercial use
.edu.ru- educational use
.gov.ru- government use
.int.ru- international organizations
.mil.ru- Russian military
.net.ru- Internet related organizations
.org.ru- noncommercial organizations