https://www.bbc.com/russian/features-59817247
https://www.bbc.com/russian/news-59815965
https://www.rbc.ru/newspaper/2021/12/29/619f93a29a79479fd98185b7
https://www.ng.ru/armies/2021-12-24/11_8335_army3.html
https://novayagazeta.ru/articles/2021/12/24/raspad-i-potom
https://www.rbc.ru/newspaper/2021/12/24/61c42af29a79474d8a0adb28
https://edition.cnn.com/2021/12/19/politics/joe-biden-russia-ukraine-obama-2014/index.html