https://www.bbc.com/russian/news-59810520
https://www.rosbalt.ru/blogs/2021/12/28/1937722.html
https://novayagazeta.ru/articles/2021/12/24/raspad-i-potom
https://www.dsnews.ua/world/na-vseh-frontah-bez-peremen-23122021-446859
https://edition.cnn.com/2021/12/19/politics/joe-biden-russia-ukraine-obama-2014/index.html
https://www.bbc.com/russian/features-59676617