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TEHRAN, IRAN - NOVEMBER 23: Russian President Vladimir Putin (L) meets with Supreme Leader of Iran Ayatollah Ali Khamenei (R) within Putin's visit for 'Gas Exporting Countries Forum' (GECF) Leaders' meeting in Tehran, Iran on November 23, 2015. (Photo by Pool / Iranian Supreme Leader Press Office/Anadolu Agency/Getty Images)

TEHRAN, IRAN - NOVEMBER 23: Russian President Vladimir Putin (L) meets with Supreme Leader of Iran Ayatollah Ali Khamenei (R) within Putin's visit for 'Gas Exporting Countries Forum' (GECF) Leaders' meeting in Tehran, Iran on November 23, 2015. (Photo by Pool / Iranian Supreme Leader Press Office/Anadolu Agency/Getty Images)