https://www.gazeta.ru/business/2017/12/30/11583752.shtml
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https://www.csis.org/analysis/russian-speaking-foreign-fighters-iraq-and-syria
https://echo.msk.ru/programs/beseda/2119648-echo/
http://intersectionproject.eu/ru/article/russia-europe/kak-vengriya-vybiraet-s-kem-druzhit
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://zn.ua/internal/ukraina-2018-doroga-mezhdu-vyzovami-i-riskami-no-doroga-270629_.html
https://www.vedomosti.ru/business/articles/2017/12/27/746739-yamal-spg
https://www.kommersant.ru/doc/3511765