The 23 year old Russian man is the 12th person arrested for the Russian spy ring which led to a dramatic spy swap between Russia and the United States.
Wall Street Journal reported that the newly arrested Russian entered the United States in Oct 2009. FBI counterintelligence agents have been investigating him since last fall when his name surfaced in a decade long espionage investigation.
The man was in federal custody. Officials reported that investigators weren"t able to gather enough evidence against him to bring charges and came to believe his case was different from that of the others who ended up being charged in the spy ring.