Russian President Vladimir Putin listens to Russia's Foreign Minister Sergey Lavrov, left, at the meeting of the Collective Security Treaty Organization (CSTO) in Dushanbe, Tajikistan, Tuesday, Sept. 15, 2015. Russian President Vladimir Putin on Tuesday strongly defended Moscow's military assistance to the Syrian government, saying it's impossible to defeat the Islamic State group without cooperating with the Syrian government. (Mikhail Klimentyev/RIA-Novosti, Kremlin Pool Photo via AP)
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