President Barack Obama has said that the US must have an "exit strategy" in Afghanistan, even as Washington sends more troops to fight Taleban militants.
He was speaking in a CBS interview, as the White House prepares to unveil a comprehensive strategy for Afghanistan.
Mr Obama said preventing attacks against the US remained its "central mission" in Afghan operations.
Earlier, the US envoy to Afghanistan and Pakistan said US policy would no longer treat the two separately.
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