In this Sept. 27, 2015, file photo, President Barack Obama speaks at the United Nations Sustainable Development Summit, Sunday, Sept. 27, 2015, at the United Nations headquarters. Face-to-face for the first time in nearly a year, Obama and Russian President Vladimir Putin on Monday, Sept. 28, will confront rising tensions over Moscow’s military engagement in Syria, as well as the stubborn crisis in Ukraine. (AP Photo/Andrew Harnik, File)
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