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https://www.csis.org/analysis/russian-speaking-foreign-fighters-iraq-and-syria
https://www.radiosvoboda.org/a/28945900.html
https://www.inopressa.ru/article/29Dec2017/nytimes/putin_ter.html
https://www.kommersant.ru/doc/3512376
https://www.kommersant.ru/doc/3512314
https://www.kommersant.ru/doc/3508333
http://www.rosbalt.ru/russia/2017/12/29/1672283.html
https://www.kommersant.ru/doc/3494226
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