The muslims in Russia are overwhelmingly Sunnis.
http://windowoneurasia2.blogspot.se/2015/10/some-of-russias-sunni-muslim-majority.html
That concern is widespread in American counterterrorism circles, where the Obama administration’s worries about appearing “Islamophobic” are well known. This White House early on warned intelligence personnel about using the term “Islamic terrorism” even in classified reports that would never be released to the public. “Since 2009 we’ve opened investigations of groups we knew to be harmless,” explained a Pentagon counterterrorism official, “they weren’t Muslims, and we needed some ‘balance’ in case the White House asked if we were ‘profiling’ potential terrorists.”
I have castigated European countries over their refusal to take their jihadism problem seriously, pointing out that the threat is now so great no intelligence service can fix it. We have been lucky in America, our domestic jihadism problem is much smaller than Europe’s on a per capita basis, but Obama’s reckless policies are changing that rapidly. No intelligence in the world can move political leaders who refuse to address terrorism and extremism realistically. There is still time to act, but not much.
http://observer.com/2015/12/the-intelligence-lessons-of-san-bernardino/