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https://www.csis.org/analysis/russian-speaking-foreign-fighters-iraq-and-syria
https://www.inopressa.ru/article/29Dec2017/nytimes/putin_ter.html
http://www.rosbalt.ru/russia/2017/12/29/1672008.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.kommersant.ru/doc/3511804
http://www.kasparov.ru/material.php?id=5A41EFE0C99FA
http://www.kasparov.ru/material.php?id=5A41402A326C4
http://www.rosbalt.ru/blogs/2017/12/25/1670969.html
http://www.kasparov.ru/material.php?id=5A3F58833D3CB