Russia

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Russian President Vladimir Putin called Greek Prime Minister Alexis Tsipras Monday as the Greek debt crisis deepened. (Associated Press) ** FILE **

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U.S. Secretary of State John Kerry, front, and U.S. Under Secretary for Political Affairs Wendy Sherman meet with foreign ministers of Germany, France, China, Britain, Russia and the European Union at a hotel in Vienna, Austria, Tuesday, July 7, 2015. (Carlos Barria/Pool photo via AP)

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U.S. Secretary of State John Kerry meets with foreign ministers of Germany, France, China, Britain, Russia and the European Union at a hotel in Vienna, Austria, Tuesday, July 7, 2015. (Carlos Barria/Pool photo via AP)

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Maria Sharapova of Russia returns a ball to Coco Vandeweghe of the United States during their singles match at the All England Lawn Tennis Championships in Wimbledon, London, Tuesday July 7, 2015. (AP Photo/Pavel Golovkin)

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In this image taken from video, a Soyuz-U rocket blasts off from the Russian leased Baikonur cosmodrome, Kazakhstan, Friday, July 3, 2015. The unmanned cargo ship is heading to the International Space Station, whose crew is anxiously awaiting it after the successive failures of two previous supply missions. (NASA TV via AP)

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In this image taken from video, a Soyuz-U rocket blasts off at the Russian leased Baikonur cosmodrome, Kazakhstan, Friday, July 3, 2015. The unmanned cargo ship is heading to the International Space Station, whose crew is anxiously awaiting it after the successive failures of two previous supply missions. (NASA TV via AP)

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President Obama insisted again Tuesday that he was not wedded to an agreement at any cost and threatened outright to "walk away" if Iran reneges on the parameters of an April interim agreement in Lausanne, Switzerland, with the so-called P5+1 negotiating group that also comprises Britain, France, China, Russia and Germany. (Associated Press)

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Serena Williams of the United States celebrates a point during the women's singles first round match against Margarita Gasparyan of Russia at the All England Lawn Tennis Championships in Wimbledon, London, Monday June 29, 2015. (AP Photo/Pavel Golovkin)

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Ilya Samsonov, center, of Russia, puts on a Washington Capitals sweater after being chosen 22nd overall during the first round of the NHL hockey draft, Friday, June 26, 2015, in Sunrise, Fla. (AP Photo/Alan Diaz)

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Russian President Vladimir Putin speaks at a joint press conference with Finnish President Sauli Niinisto in the Novo-Ogaryovo residence outside Moscow, Russia, Tuesday, June 16, 2015. (Alexander Nemenov/Pool Photo via AP)

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Russian President Vladimir Putin arrives for the opening of the Army-2015 international military show in Kubinka, outside Moscow, on Tuesday, June 16, 2015. (Vasily Maximov/AFP pool photo via AP) ** FILE **

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Russian President Vladimir Putin has allied himself with Alexander Zaldostanov, also known as The Surgeon, the leader of the Night Wolves biker group. (Associated Press)

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Pope Francis meets Russian President Vladimir Putin on the occasion of a private audience at the Vatican, Wednesday, June 10, 2015. (AP Photo/Gregorio Borgia, Pool)

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FILE - In this Thursday, Dec. 2, 2010 file photo, FIFA President Sepp Blatter announces Russia to host the 2018 World Cup during the announcement of the host country for the 2018 soccer World Cup in Zurich, Switzerland. FIFA has been plunged into crisis since seven officials were arrested in dawn raids last week at a luxury Zurich hotel and in a separate probe, Swiss authorities are investigating the 2018 and 2022 World Cup bidding contests, which went to Russia and Qatar. (AP Photo/Michael Probst, File)

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Viktoria Ktsoyeva, an injured schoolgirl who escaped from the seized Russian school, holds a cross in her hand in a hospital in Beslan, North Ossetia, Russia Friday, Sept. 3, 2004. Commandos stormed a school Friday in southern Russia where hundreds of hostages had been held for three days, sending hostage-takers and their captives fleeing in a scene of chaos amid explosions and gunfire. (AP Photo/Musa Sadulayev)

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Russian President Vladimir Putin attends a ceremony in the Kremlin in Moscow, Russia, in this May 28, 2015, file photo. (Sergei Karpukhin/File-Pool Photo via AP) ** FILE **

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Russian President Vladimir Putin chairs a meeting of the Security Council in the Kremlin in Moscow, Russia, Friday, May 29, 2015. Russian President Vladimir Putin signed a decree on Thursday to make losses of Russian troops who are on "special operations" in peacetime, a state secret. (Alexei Nikolsky/RIA-Novosti, Kremlin Pool Photo via AP)