https://edition.cnn.com/2021/12/19/politics/joe-biden-russia-ukraine-obama-2014/index.html
https://novayagazeta.ru/articles/2021/12/17/napadete-nakazhem
https://www.ng.ru/world/2021-12-16/1_8329_sanctions.html
https://novayagazeta.ru/articles/2021/12/13/vagner-doigralsia
http://www.kasparov.ru/material.php?id=61B52555207D0§ion_id=444F8A447242B
https://www.bbc.com/russian/features-59552095