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https://www.csis.org/analysis/russian-speaking-foreign-fighters-iraq-and-syria
https://ru.krymr.com/a/28945910.html
https://www.inopressa.ru/article/29Dec2017/nytimes/putin_ter.html
https://www.kommersant.ru/doc/3512319
Vladimir V. Putin, who is running for a fourth term as Russia’s president, has burnished his reputation for being tough on extremists.
https://republic.ru/posts/88740
http://www.rosbalt.ru/world/2017/12/28/1671249.html
https://www.gazeta.ru/sport/2017/12/28/a_11564102.shtml