The new Russian nuclear-powered icebreaker Arktika launches in St. Petersburg, Russia, on Thursday. Russia has been modernizing its icebreaker fleet as part of its efforts to strengthen its Arctic presence. Evgeny Uvarov/AP hide caption

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At the height of the Cold War, the FBI and the National Security Agency built a secret tunnel beneath the Russian Embassy (shown here in 2013), so that American spies could eavesdrop on what was happening inside. J. Scott Applewhite/AP hide caption

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Decades After Cold War's End, U.S.-Russia Espionage Rivalry Evolves

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Democratic National Committee Chairwoman Debbie Wasserman Schultz said the DNC is working to secure its network as quickly as possible. She's shown here in 2014. Mandel Ngan/AFP/Getty Images hide caption

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Russian Hackers Penetrate Democratic National Committee, Steal Trump Research

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Ukrainian pilot Nadiya Savchenko (center), who was freed from jail in Russia as part of a prisoner exchange, talks to the media upon arrival at Kiev's Boryspil airport on Wednesday. Anatolii Stepanov /AFP/Getty Images hide caption

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Jehovah's Witnesses sing songs during a meeting in Rostov-on-Don, Russia, in November 2015. The country's top prosecutor is threatening a nationwide ban for alleged "extremism." Alexander Aksakov/The Washington Post/Getty Images hide caption

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Russia's Jehovah's Witnesses Fight 'Extremist' Label, Possible Ban

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People in Moscow hold portraits of relatives who fought in World War II during the Immortal Regiment march on the day of the 71st anniversary of the victory over Nazi Germany in World War II. Anadolu Agency/Getty Images hide caption

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Journalists walk near parts of Malaysia Airlines flight MH17 near the Grabove village in eastern Ukraine on Nov. 11, 2014. MENAHEM KAHANA/AFP/Getty Images hide caption

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Russian Military Involved In Shooting Down Flight MH17, Researchers Say

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An independent paper owned by billionaire Russian businessman and Brooklyn Nets owner Mikhail Prokhorov — shown here Jan. 11 in New York — is under fire, but the Kremlin says it's not applying pressure on media. Seth Wenig/AP hide caption

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For Journalists In Russia, 'No One Really Knows What Is Allowed'

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Russian President Vladimir Putin gestures while answering a question during his annual televised call-in show in central Moscow on Thursday. Mikhail Klimentyev/AFP/Getty Images hide caption

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Employees prepare a convoy of four trucks transporting warm clothes and shoes to refugees in Ukraine, at the initiative of the French Red Cross, on Feb. 26 in Saint-Quentin-Fallavier, France. JEAN-PHILIPPE KSIAZEK/AFP/Getty Images hide caption

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Ukrainians Who Fled To Russia Find The Welcome Is No Longer Warm

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About 40 percent of Russia's food is imported. As the value of the ruble has declined, prices at grocery stores have risen. Anadolu Agency/Getty Images hide caption

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In Russia, The Oil Price Drop Hits Putin's Base Hard

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Ukrainian pilot Nadezhda Savchenko applauds and smiles in a glass cage inside court ahead of the verdict in the town of Donetsk, Rostov-on-Don region, Russia, on Tuesday. Ivan Sekretarev/AP hide caption

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Russian President Vladimir Putin (right) hosts Syrian President Bashar Assad during a meeting at the Kremlin in Moscow. The meeting took place in October, shortly after Russia began a bombing campaign in Syria in support of Assad. Putin abruptly announced Monday that Russia was withdrawing most of its military forces. Alexey Druzhinin/AFP/Getty Images hide caption

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Russian bombers parked at Hmeimim air base in Syria on March 4. Since the cease-fire began in late February, the warplanes have mostly stayed on the ground. Pavel Golovkin/AP hide caption

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Mikhail Lesin, a former Russian press minister and adviser to President Vladimir Putin, was found dead in November. A new report contradicts earlier reports in Russian media that he died from a heart attack. Alexander Nemenov/AFP/Getty Images hide caption

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Russia's Vladimir Putin makes a speech in 2009 after receiving an award in Dresden, Germany, where he served as a KGB officer during the Cold War. Norbert Millauer/AFP/Getty Images hide caption

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Spy Vs. Spies: Why Deciphering Putin Is So Hard For U.S. Intelligence

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Order 23 of the USSR People's Commissar of Defense, dated March 14, 1944, on transforming Civil Air Fleet 1st Separate Aviation Regiment into Civil Air Fleet 120th Guards Separate Aviation Regiment, bearing the signature of Joseph Stalin. Courtesy of the U.S.Embassy, Moscow, via Flickr hide caption

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U.S. Returns Historical Documents, Stolen From Russia In Chaotic '90s

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Members of Russia's Emergency Situations Ministry attend a ceremony for miners killed at the Severnaya coal mine in a town north of the Arctic Circle. Alexei Shtokal/TASS via Getty Images hide caption

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