The New York Post offers the name, background and a photo of the Russian defector who blew the covers of the Russian spy ring to the FBI.
The newspaper reports that the defector was a Russian Colonel named Alexander Poteyev (seen on the right in the above photo).
Poteyev defected to the United States and gave the names of the Russian sleeper agents in America, including Anna Chapman (seen on the left in the above photo).
You can read the newspaper story via the below link:
You can also read an earlier post on the Russian spy ring via the below link: