https://carnegie.ru/commentary/85935
https://www.rbc.ru/newspaper/2021/12/06/61aa3c879a7947e608b37485
https://www.nytimes.com/2021/12/05/world/europe/putin-russia-ukraine-troops.html
https://www.rosbalt.ru/blogs/2021/12/02/1933799.html
https://www.kp.ru/daily/28364/4513237/