
https://www.brookings.edu/articles/backstopping-ukraines-long-term-security-toward-an-atlantic-asian-security-community/

https://www.brookings.edu/articles/why-do-us-presidents-like-military-assistance/

http://www.css.ethz.ch/content/dam/ethz/special-interest/gess/cis/center-for-securities-studies/pdfs/ST2018.pdf