https://www.brookings.edu/articles/why-do-us-presidents-like-military-assistance/
https://www.bbc.com/news/world-europe-54964858
https://www.brookings.edu/blog/order-from-chaos/2019/09/13/the-problem-at-the-core-of-progressive-foreign-policy/?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=76826994
https://rusi.org/explore-our-research/publications/commentary/giving-raf-typhoons-ukraine-would-be-very-expensive-symbolic-gesture