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https://www.csis.org/analysis/russian-speaking-foreign-fighters-iraq-and-syria
https://www.radiosvoboda.org/a/28945900.html
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/comments/column/desnitsky/11508710.shtml
https://www.gazeta.ru/science/2017/12/25_a_11528876.shtml
http://www.kasparov.ru/material.php?id=5A41402A326C4
http://expert.ru/ural/2018/01/sotsialnyih-revolyutsij-ne-ozhidaetsya/
https://www.kommersant.ru/doc/3501077
http://www.ng.ru/week/2017-12-24/8_7143_culture.html