https://hvylya.net/analytics/244375-ultimatum-putina-i-rossiysko-ukrainskaya-voyna-2022
https://www.rbc.ru/newspaper/2021/12/24/61c42af29a79474d8a0adb28
https://www.bbc.com/russian/features-59676617
https://www.radiosvoboda.org/a/arestovych-putin-biden-viyna-donbas/31604580.html