U.S. Defense Secretary James Mattis said on Monday that the United States had recently discussed the use of chemical weapons in Syria with Russia, after media reports that Syria was moving chemical weapons into a rebel-held area the government seeks to recapture.

"You have seen our administration act twice on the use of chemical weapons," Mattis told reporters. "I will assure you that (the) Department of State has been in active communication, recent active communication, with Russia to enlist them in preventing this ... The communication is going on."

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