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Russian President Vladimir Putin, left, and U.S. Secretary of State John Kerry shake hands during their meeting in the Kremlin in Moscow, Tuesday, May 7, 2013. John Kerry is making his case to Russian President Vladimir Putin for Russia to take a tougher stance on Syria at a time when Israel's weekend air strikes against the beleaguered Mideast nation have added an unpredictable factor to the talks. (AP Photo/RIA-Novosti, Mikhail Klimentyev, Presidential Press Service)

Associated Press
Russian President Vladimir Putin, left, and U.S. Secretary of State John Kerry shake hands during their meeting in the Kremlin in Moscow, Tuesday, May 7, 2013. John Kerry is making his case to Russian President Vladimir Putin for Russia to take a tougher stance on Syria at a time when Israel's weekend air strikes against the beleaguered Mideast nation have added an unpredictable factor to the talks. (AP Photo/RIA-Novosti, Mikhail Klimentyev, Presidential Press Service)
Russian President Vladimir Putin, left, and U.S. Secretary of State John Kerry shake hands during their meeting in the Kremlin in Moscow, Tuesday, May 7, 2013. John Kerry is making his case to Russian President Vladimir Putin for Russia to take a tougher stance on Syria at a time when Israel's weekend air strikes against the beleaguered Mideast nation have added an unpredictable factor to the talks. (AP Photo/RIA-Novosti, Mikhail Klimentyev, Presidential Press Service)
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