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PETERSBURG, RUSSIA - SEPTEMBER 06: In this handout image provided by Host Photo Agency, Russian President Vladimir Putin attends the G20 Summit on September 6, 2013 in St. Petersburg, Russia. Leaders of the G20 nations made progress on tightening up on multinational company tax avoidance, but remain divided over the Syrian conflict as they enter the final day of the Russian summit. (Photo by Iliya Pitalev/Host Photo Agency via Getty Images)
PETERSBURG, RUSSIA - SEPTEMBER 06: In this handout image provided by Host Photo Agency, Russian President Vladimir Putin attends the G20 Summit on September 6, 2013 in St. Petersburg, Russia. Leaders of the G20 nations made progress on tightening up on multinational company tax avoidance, but remain divided over the Syrian conflict as they enter the final day of the Russian summit. (Photo by Iliya Pitalev/Host Photo Agency via Getty Images)

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White House officials respond after Russia's president writes an open letter blaming Syrian rebels for chemical attacks.

Should world trust Vladimir Putin?

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