https://novayagazeta.ru/articles/2021/12/15/taina-podlosti-na-ntv
https://www.ng.ru/armies/2021-12-14/1_8326_moscow.html
https://www.ng.ru/dipkurer/2021-12-12/9_8324_negotiation.html
https://carnegie.ru/commentary/85935
https://www.nytimes.com/2021/12/05/world/europe/putin-russia-ukraine-troops.html