https://novayagazeta.ru/articles/2021/12/10/operatsiia-w
https://www.ng.ru/education/2021-12-08/8_8321_children.html
https://www.rosbalt.ru/blogs/2021/12/07/1934564.html
https://carnegie.ru/commentary/85935
https://www.nytimes.com/2021/12/05/world/europe/putin-russia-ukraine-troops.html