Because of the Cold War.
Russia is not a member of the Commonwealth of Nations and so is not eligible to participate in the Commonwealth Games. Russia is a major participant in the Olympic Games.
Russia has sent competitors to most of the Olympic games
Russia has no formal ratings board and no games have been banned in Russia due to excessive violence, nudity, negative portrayal of people of Russia or expression of religious views of any kind because of freedom of speech guaranteed by the Constitution of Russia. Media in America and Europe have falsely reported that Call of Duty: Modern Warfare 2, which features a storyline in which Russian "ultranationalists" take control of the country and invade the United States, was banned in Russia. Activision called these reports 'erroneous'.[31] The Russian version of this game was edited by removing the optional level (the player is given the option to skip the level at any time) "No Russian" where the player is given the option to shoot Russian civilians in an airport.Quoted from Wikipedia see related link
The first Winter Olympic Games held in Russia were in Sochi in 2014.
In Russia
1980
Yes, Russia are competing in the 2012 Summer Olympics in London.
Russia first entered the Olympics in 1994
Moscow, Russia
Sochi, Russia
Sochi, Russia.
beer pong