https://hvylya.net/analytics/244375-ultimatum-putina-i-rossiysko-ukrainskaya-voyna-2022
https://www.rosbalt.ru/blogs/2021/12/28/1937722.html
https://www.kommersant.ru/doc/5153396
https://nvo.ng.ru/nvo/2021-12-23/2_1171_nvoweek.html
https://www.rbc.ru/newspaper/2021/12/24/61c34e3f9a79470ec7ba9221
https://www.ng.ru/armies/2021-12-21/2_8332_missile.html
https://edition.cnn.com/2021/12/19/politics/joe-biden-russia-ukraine-obama-2014/index.html
https://ru.krymr.com/a/rossiya-zapad-nato-ukraina-naprayzhennost-vtorzheniye-ugroza/31614512.html