https://www.rosbalt.ru/world/2021/12/30/1937990.html
http://region.expert/defederalization/
https://hvylya.net/analytics/244375-ultimatum-putina-i-rossiysko-ukrainskaya-voyna-2022
https://www.rbc.ru/newspaper/2021/12/28/61c21e289a79479e8562641b
https://www.bbc.com/russian/news-58966676
https://novayagazeta.ru/articles/2021/12/27/den-osvobozhdeniia
https://www.ng.ru/armies/2021-12-24/11_8335_army3.html