https://www.washingtonpost.com/outlook/2022/05/11/ukraine-war-expansion-risks-nuclear/?utm_campaign=Brookings%20Brief&utm_medium=email&utm_content=213307436&utm_source=hs_email
https://www.gmfus.org/sites/default/files/2022-02/Keil%20-%20NATO%20core%20tasks%20-%20brief%20NEW.pdf
https://watson.brown.edu/costsofwar/files/cow/imce/people/Walkup%20Jayes_War%20Paradigm%20Paper_2022_02_08.pdf