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https://www.csis.org/analysis/russian-speaking-foreign-fighters-iraq-and-syria
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
http://www.kasparov.ru/material.php?id=5A4516997A61D
https://www.radiosvoboda.org/a/donbass-realii/28936298.html
http://www.kasparov.ru/material.php?id=5A3FD839DFD13
http://www.kasparov.ru/material.php?id=5A41402A326C4