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
http://www.kasparov.ru/material.php?id=5A462801E9835
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://www.kommersant.ru/doc/3509202
http://www.kasparov.ru/material.php?id=5A41402A326C4
http://www.kasparov.ru/material.php?id=5A3E30152BB61
https://www.kommersant.ru/doc/3507282
https://www.vedomosti.ru/politics/articles/2017/12/21/746084-vibori-prezidenta-rossii