http://region.expert/defederalization/
https://www.rosbalt.ru/russia/2021/12/29/1937757.html
https://theins.ru/opinions/pavel-chikov/247514
https://novayagazeta.ru/articles/2021/12/24/raspad-i-potom
http://www.kasparov.ru/material.php?id=61C19701BA317
https://edition.cnn.com/2021/12/19/politics/joe-biden-russia-ukraine-obama-2014/index.html
https://www.bbc.com/russian/features-59676617
https://theins.ru/history/247176