https://www.gazeta.ru/army/2017/12/30/11585354.shtml
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https://www.csis.org/analysis/russian-speaking-foreign-fighters-iraq-and-syria
https://politeka.net/reading/561811-natsbezpeka-ukrayini-peremogi-porazki-ta-stsenariyi-na-2018-rik/
https://echo.msk.ru/programs/beseda/2119648-echo/
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://nv.ua/opinion/tsaplienko/ob-odnom-osvobozhdennom-naemnike-2442492.html