But president rejects US responsibility for region: 'Anyone who wants to assist in protecting the Kurds is good with me, whether it is Russia, China, or Napoleon Bonaparte'
One expert says troop pullout will impact US credibility for years to come; another believes president's stock in Mideast has plummeted while Putin's is skyrocketing
EU chief says political solution is only way to end the Syrian conflict; NATO calls for Turkey to avoid actions that may further destabilize the region
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