Who is behind the deadly attack on a Moscow concert hall? And did Russia ignore the tip of a possible attack the U.S. passed on earlier this month? Former CIA and FBI official Tracy Walder discusses the issue on NewsNation’s “Elizabeth Vargas Reports.”

#Russia #Moscow #Kremlin

Anchor Elizabeth Vargas delivers the biggest stories, without bias or opinion. Watch "Elizabeth Vargas Reports" every weeknight at 6p/5C on NewsNation. #VargasReports

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