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Russian President Vladimir Putin (L) greets Tajikistan's President Emomali Rahmon ahead of a meeting of the Collective Security Council of the CSTO (Collective Security Treaty Organisation) at the Kremlin in Moscow on December 21, 2015. AFP PHOTO / SPUTNIK / ALEXEI DRUZHININ / AFP / SPUTNIK / ALEXEI DRUZHININ (Photo credit should read ALEXEI DRUZHININ/AFP/Getty Images)

Russian President Vladimir Putin (L) greets Tajikistan's President Emomali Rahmon ahead of a meeting of the Collective Security Council of the CSTO (Collective Security Treaty Organisation) at the Kremlin in Moscow on December 21, 2015. AFP PHOTO / SPUTNIK / ALEXEI DRUZHININ / AFP / SPUTNIK / ALEXEI DRUZHININ        (Photo credit should read ALEXEI DRUZHININ/AFP/Getty Images)