https://carnegie.ru/commentary/85935
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://jamestown.org/program/chechnya-ingushetia-again-at-odds-over-long-disputed-border/