https://theins.ru/opinions/pavel-chikov/247514
https://24tv.ua/nagadali-pro-budapeshtskiy-memorandum-novini-rosiyi-i-ukrayini_n1822928
https://theins.ru/politika/247147
http://www.kasparov.ru/material.php?id=61B49F42A54FD§ion_id=444F8A447242B
https://carnegie.ru/commentary/85935
https://www.nytimes.com/2021/12/05/world/europe/putin-russia-ukraine-troops.html