https://www.dw.com/ru/kak-vakcinacija-vlijaet-na-smertnost-ot-kovida-v-rossii/a-60041130
https://carnegie.ru/commentary/85935
https://www.rosbalt.ru/blogs/2021/12/07/1934490.html
https://www.nytimes.com/2021/12/05/world/europe/putin-russia-ukraine-troops.html
https://www.bbc.com/russian/news-59527176