Factbox: Details of 10 Russian agents in U.S. spy affair

(Reuters) - The U.S. government said Russia agreed to release four prisoners as part of a spy swap after 10 people accused of being undercover Russian agents in the United States pleaded guilty in court and agreed to be deported.

An 11th suspect was arrested in Cyprus but has disappeared.

Here is a description of the defendants:

CHRISTOPHER ROBERT METSOS

Metsos, who purports to be Canadian, was arrested in Cyprus on June 29 before disappearing while he was free on bail. He is accused of receiving and distributing money to the group and of conspiracy to commit money laundering. According to the U.S. Justice Department, he was given payments by a Russian official affiliated with Moscow's mission to the United Nations in a spy novel style "brush-pass" handoff and buried money in rural New York that was recovered two years later by another suspect.

RICHARD AND CYNTHIA MURPHY

The married couple were arrested at their house in Montclair, New Jersey, an affluent suburb of New York City. Both claimed to be U.S. citizens, he born in Philadelphia and she in New York. In court on Thursday, they said their real names were Vladimir and Lydia Guryev, 44 and 39 years old, respectively. They are Russian citizens.

DONALD HOWARD HEATHFIELD AND TRACEY LEE ANN FOLEY

Arrested at their Boston townhouse, they purported to be naturalized U.S. citizens from Canada. Heathfield met a U.S. government employee on nuclear weapons research, a criminal complaint said. Heathfield may have assumed the identity of a Canadian man who died in 2005, court papers said. He told the court he is actually Andrey Bezrukov, 49. Foley is Elena Vavilova, 47. Both are Russian.

MICHAEL ZOTTOLI AND PATRICIA MILLS

After living in Seattle, the couple moved in 2009 to an apartment in Arlington, Virginia, near Washington, D.C., where they were arrested. Zottoli claimed to be a U.S. citizen, while Mills said she was Canadian, court papers said. After their arrest, they revealed their real names as Mikhail Kutzik, 49, and Natalia Pereverzeva, 36, and said they were from Russia. Zottoli dug up the package of money Metsos had buried, officials said.

JUAN LAZARO AND VICKY PELAEZ

The married couple were arrested at their home in Yonkers, just north of New York City. Pelaez, a native of Peru, was a columnist for the New York Spanish-language daily El Diario. Both traveled to South America to meet Russian officials, U.S. prosecutors said. Juan Lazaro is really Mikhail Anatonoljevich Vasemkov, 66, and is a Russian citizen.

ANNA CHAPMAN

Also known as Anya Kushchenko, the 28-year-old was arrested in Manhattan, where she ran a $2 million real estate business, her lawyer said in court last week. The New York Post and other media have reported Chapman was often spotted at popular night clubs.

MIKHAIL SEMENKO

Arrested at his home in Arlington, he is accused of using sophisticated communications equipment and making incriminating statements to an undercover agent posing as a Russian official.

(Reporting by New York Newsroom; Editing by John O'Callaghan)