https://www.gazeta.ru/comments/2017/12/28_a_11561696.shtml
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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
Vladimir V. Putin, who is running for a fourth term as Russia’s president, has burnished his reputation for being tough on extremists.
http://www.kasparov.ru/material.php?id=5A4345BAAAA47
http://www.rosbalt.ru/world/2017/12/26/1671386.html
http://www.kasparov.ru/material.php?id=5A4265007D2AC
https://www.gazeta.ru/comments/column/kolesnikov/11509418.shtml
https://ru.krymr.com/a/28939115.html
http://www.kasparov.ru/material.php?id=5A41402A326C4