The charred remains of the Doctors Without Borders hospital is seen on Oct 16, almost two weeks after it was hit by a U.S. airstrike in Kunduz, Afghanistan. Najim Rahim/AP hide caption

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A Russian warplane taxies at Hemeimeem airbase in Syria. Advocates say a no-fly zone would keep Syrian aircraft from attacking anti-government rebels and endangering civilians, which might allow Syrians to feel safe enough to stay put. Vladimir Isachenkov/AP hide caption

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