Russian supporters of NSA leaker Edward Snowden rally in central Moscow on July 12. Russia says it won't extradite Snowden to the United States, but it has cooperated with other countries in the past. Evgeny Feldman/AFP/Getty Images hide caption

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Edward Snowden, seen during a video interview with The Guardian. Glenn Greenwald/Laura Poitras/EPA/Landov hide caption

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Lee Harvey Oswald, the assassin of President Kennedy in 1963, had defected to the Soviet Union several years earlier, but returned to the U.S. after becoming disillusioned with that country. He is shown here in a Dallas police station after his arrest for Kennedy's shooting. AP hide caption

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Edward Snowden, center, at Moscow's Sheremetyevo Airport on July 12. At left is WikiLeaks' Sarah Harrison. Courtesy of Human Rights Watch hide caption

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Russian opposition leader Alexei Navalny and his wife, Yulia, look at a mobile phone Thursday during his trial in Kirov, Russia. A Russian judge found Navalny guilty of embezzlement. Dmitry Lovetsky/AP hide caption

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Sergei Magnitsky, who died in jail in 2009, was convicted of tax evasion on July 11, 2013. Kremlin critics say this was just the strangest of several legal cases against government opponents. Misha Japaridze/AP hide caption

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A Russian state service in charge of safeguarding Kremlin communications is reportedly looking to purchase an array of old-fashioned typewriters to prevent leaks from computer hardware. John MacDougall/AFP/Getty Images hide caption

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Sergei Magnitsky's mother, Nataliya Magnitskaya, holds a photo of her late son in 2009. Alexander Zemlianichenko/Associated Press hide caption

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Nurse Marina Bogdanova, with Sputnik, gives medications to Sergei Gaptenko, who is close to finishing treatment for drug-resistant tuberculosis. Konstantin Salomatin for NPR hide caption

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