From Russia With Hate

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Media Outlet: CNN

Peter Bergen and David Sterman wrote for CNN about Russian citizens that join ISIS: 

The news that the Istanbul attack was carried out by a Russian and citizens of Central Asian states that were once part of the Soviet Union might surprise those who have hitherto seen the group as a collection of mostly Arab fighters with a large Western European contingent.
Yet in fact, Russian citizens -- many of whom are Chechens or Dagestanis from the largely Muslim North Caucasus region of Russia -- are the largest group of foot soldiers in ISIS from a non-Muslim majority country, and they have played key roles in the group.
According to Turkish officials the attack at Istanbul airport was carried out by terrorists from Russia, Uzbekistan, and Kyrgyzstan and was planned by ISIS's leadership.

Authors:

Peter Bergen is a journalist, documentary producer, vice president at New America, CNN national security analyst, professor of practice at Arizona State University, and the author or editor of seven books, three of which were New York Times bestsellers and four of which were named among the best non-fiction books of the year by The Washington Post.

David Sterman is a policy analyst in New America's International Security program. He holds a master's degree from Georgetown’s Center for Security Studies.