He quit the service in 1997 and settled in the United States, but Russia enticed him back and arrested him in 2001. He was convicted on charges of passing secret information about Russian agents working under cover in the United States and about American sources working for Russian intelligence.
Some might find it unfair to exchange 10 Russian spies for four American.
"We should not look at the numbers of people that were exchanged, but the quality," Nekrassov said. "On balance the four American spies probably are more important than the 10 Russian spies. The Americans gained an advantage in this spy exchange."
Vice President Joe Biden expressed the same sentiment on "The Tonight Show" Friday, when host Jay Leno asked about whether the deal was really fair.
"We got back four really good ones," Biden said. "And the 10, they've been here a long time, but they hadn't done much."
The Associated Press contributed to the report.