https://www.rosbalt.ru/russia/2021/12/10/1935140.html
https://www.rbc.ru/newspaper/2021/12/08/61af0c3e9a7947ae2c8b653a
https://www.ng.ru/news/726937.html
https://carnegie.ru/commentary/85935
https://www.nytimes.com/2021/12/05/world/europe/putin-russia-ukraine-troops.html