A buildup of Russian forces and equipment in and around Syria has sparked concern that the situation could escalate, but according to White House Press Secretary Josh Earnest, the motive for the buildup isn’t known:

Anybody buy that one?

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Related:

United States will take in at least 10,000 ‘extensively screened’ Syrian refugees

FBI still maintains it has no means of vetting 10,000 ‘extensively screened’ Syrian refugees