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https://www.csis.org/analysis/russian-speaking-foreign-fighters-iraq-and-syria
https://www.kommersant.ru/doc/3511567
https://www.kommersant.ru/doc/3512383
https://www.inopressa.ru/article/29Dec2017/nytimes/putin_ter.html
Vladimir V. Putin, who is running for a fourth term as Russia’s president, has burnished his reputation for being tough on extremists.
https://www.gazeta.ru/army/2017/12/28/11562134.shtml
https://www.gazeta.ru/politics/2017/12/27_a_11551004.shtml
https://www.gazeta.ru/army/2017/12/26/11548646.shtml
http://www.ng.ru/courier/2017-12-25/9_7143_siria.html