Bodyguards accompany former-CIA spy Col. Ryszard Kuklinski, left, during a short walk in the historic Old Square in Krakow, Poland, Thursday, April 30, 1998. Kuklinski, who has lived undercover in the U.S. for the last 17 years after passing thousands of pages of secret Warsaw Pact documents to the CIA, is on an 11-day emotional pilgrimage to his homeland, the first after he was smuggled out of Poland 17 years ago. (AP Photo/Czarek Sokolowski)

In this photo taken Friday, June 8, 2012, Russian ex-spy Anna Chapman walks a Turkish catwalk at a fashion show in Antalya, Turkey. The 30-year-old Chapman was deported from the United States in 2010 along with nine other Russian sleeper agents. (AP Photo)

Russian Anna Chapman, who was deported from the U.S. in July 2010 on charges of espionage, watches models display creations by Turkish designer Cengiz Abazoglu during Fashion Week in Moscow, Russia, Friday, March 23, 2012. (AP Photo/Mikhail Metzel)

Aldrich Ames leaves a court in Northern Virginia 22 February 1994 after being arrested on spy charges. Ames pleaded guilty 28 April to giving up important CIA secrets to Soviet agents for nine years. Ames was sentenced to life in prison.

US marshalls escort Aldrich Ames (C) out of federal court 28 April 1994 after he pleaded guilty to espionage and tax evasion charges and was sentenced to life in prison. Ames' wife Rosario Ames pleaded guilty to related, but lesser, espionage charges and will be sentenced 26 August.

Former CIA agent Aldrich Ames leaves federal court after pleading guilty to espionage and tax evasion conspiracy charges in Alexandria, Va., Thursday, April 28, 1994. Aldrich, the highest ranking CIA employee ever caught spying, was sentenced to life in prison. (AP Photo/Denis Paquin)

Former CIA agent Aldrich Ames leaves federal court after pleading guilty to espionage and tax evasion conspiracy charges in Alexandria, Va., Thursday, April 28,1994. Aldrich, the highest ranking CIA employee ever caught spying, was sentenced to life in prison. (AP Photo/Wilfredo Lee)

Gunter Guillaume, former personal aide to ex-chancellor Willy Brandt, hands chocolate to his wife Christl, as they meet in the dock at the start of their trial in Dusseldorf, West Germany, June 24, 1975. Guillaume is charged with delivering secret documents from the Western military alliance to East Berlin in 1972-73 when as Brandt?s aide he had access to top secret documents. His wife Christl is charged with high treason and aiding in breach of official secrets while acting as her husband's courier. Both were arrested in 1974. (AP Photo/Heinz Ducklau)

PHOTO: EAST NEWS/AFP PHOTO Undated and unlocated picture of Ethel Rosenberg (1915-53). Julius and Ethel Rosenberg, husband and wife, joined in 1939 the US Communist Party, and were convicted of being part of a transatlantic spy ring uncovered after the trial of Klaus Fuchs in Britain. They were found guilty in 1951 in a highly controversial trial of passing on atomic secrets to the Soviet Union and became the first US civilians to be executed for espionage in Sing Sing Prison 19 June 1953.

PHOTO: EAST NEWS/AFP PHOTO Combo of three pictures of Julius Rosenberg (1918-53) is seated in a police van in 1950 in New York shortly after his arrest. Julius and Ethel Rosenberg, husband and wife, joined the in 1939 the US Communist Party, and were convicted in 1951 of being part of a transatlantic spy ring uncovered after the trial of Klaus Fuchs in Britain. They were found guilty in a highly controversial trial of passing on atomic secrets to the Soviet Union and became the first US civilians to be executed for espionage in Sing Sing Prison 19 June 1953.

Ethel and Julius Rosenberg are shown during their trial for espionage in New York City in 1951. The couple is accused of conspiring to recruit her brother, David Greenglass, into gathering

Here are closeup Facial studies of Julius and Ethel Rosenberg, the convicted husband and wife atom spy team, scheduled to die in the Sing Sing Prison Electric chair at Ossining, N.Y., June 13, 1953. (AP Photo)

This November, 1987, made-from-TV picture shows British double agent Kim Philby, who defected to the Soviet Union in 1963, during an interview on Soviet TV. AP Photo).

Photo: Laski Diffusion / East News Harold "Kim" Philby, a high-ranking member of British intelligence who worked as a double agent before defecting to the Soviet Union in 1963. He served as both an NKVD and KGB operative. Pictured: Kim Philby and his wife Rufina Ivanovna Pukhova, USSR, 70s.

Photo: Laski Diffusion / East News Harold "Kim" Philby, a high-ranking member of British intelligence who worked as a double agent before defecting to the Soviet Union in 1963. He served as both an NKVD and KGB operative. Source: KGB museum, Moscow

Photo: Laski Diffusion / East News Harold "Kim" Philby, a high-ranking member of British intelligence who worked as a double agent before defecting to the Soviet Union in 1963. He served as both an NKVD and KGB operative. Source: KGB museum, Moscow

PHOTO: EAST NEWS/AFP portrait dat?? de 1951 de l'espion britannique des services de contre-espionnage anglais Kim Philby. La presse britannique a publi?? le 01 octobre 1967, des articles selon lesquels Kim Philby, actuellement en Union Sovi??tique,j travaillait pour les renseignements russes depuis 1934. Le porte-parole du Foreign Office a d??clar?? qu'ils ne faisaient "jamais de commentaires sur des informations de cette nature". En 1951 Philby avait ??t?? f??licit?? pour avoir contribu?? ?. la fuite de Burgess et Maclean en URSS.

Russian newspaperman Richard Sorge, who did espionage for the Russian government during World War II and was later executed by the Japanese, is shown on February 21, 1947. (AP Photo)

Undated picture of dutch dancer and spy Margaretha Geertruida Zelle, better-known as Mata Hari. Exotic dancer and courtesan in Paris, she became spy during the World War I. Mata Hari was arrested in her Paris hotel room on 13 February 1917, put on trial, accused of spying for Germany and was executed by firing squad 15 Octobre 1917 in Vincennes.

An undated photo of Mata Hari. (AP Photo)