https://www.bbc.com/russian/news-46634112
https://www.novayagazeta.ru/articles/2018/12/20/78994-bolshe-konfrontatsii-bolshe-deneg
https://www.gazeta.ru/politics/2018/12/19_a_12100165.shtml
https://www.gazeta.ru/army/2018/12/18/12099847.shtml
https://www.gazeta.ru/army/2018/12/17/12097543.shtml
https://www.gazeta.ru/army/2018/12/15/12096187.shtml
https://www.inopressa.ru/article/13Dec2018/ft/rsmd.html
https://www.ft.com/content/1fd4fa8e-fd36-11e8-b03f-bc62050f3c4e