https://www.reuters.com/world/europe/putin-issues-warning-us-with-new-nuclear-doctrine-2024-11-19/
https://thebulletin.org/2022/03/read-the-fine-print-russias-nuclear-weapon-use-policy/
https://thebulletin.org/2024/10/why-russia-is-more-likely-to-go-nuclear-in-ukraine-if-its-winning/
https://www.csis.org/analysis/why-russia-changing-its-nuclear-doctrine-now
https://edition.cnn.com/2024/11/19/europe/ukraine-russia-atacms-biden-strike-intl/index.html
https://en.wikipedia.org/wiki/Red_lines_in_the_Russo-Ukrainian_War#Russian_red_lines
https://meduza.io/en/feature/2023/10/18/a-potential-game-changer
https://www.kyivpost.com/post/42443
https://news.sky.com/story/is-putin-ready-to-reach-for-the-red-button-13256699