http://www.bbc.com/russian/features-43219411
https://ru.krymr.com/a/29065000.html
https://www.svoboda.org/a/29066030.html
http://docs.house.gov/meetings/AS/AS00/20180227/106870/HHRG-115-AS00-Wstate-VotelJ-20180227.pdf
Putin’s Syria intervention saved Assad. But is he ready for what comes next?
https://www.ft.com/content/bc5287b4-1830-11e8-9376-4a6390addb44
https://www.foreignaffairs.com/articles/syria/2018-02-26/russias-mercenary-debacle-syria
https://www.inopressa.ru/article/26Feb2018/ft/election.html
http://www.ng.ru/armies/2018-02-26/8_7180_snv3.html
http://carnegie.ru/2018/02/26/ru-pub-75620