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https://www.csis.org/analysis/russian-speaking-foreign-fighters-iraq-and-syria
https://www.radiosvoboda.org/a/28945900.html
https://echo.msk.ru/programs/beseda/2119648-echo/
https://www.radiosvoboda.org/a/28945769.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://theins.ru/politika/86416
http://hvylya.net/analytics/politics/chomu-kreml-pogodivsya-na-obmin-polonenimi.html