https://www.ips-journal.eu/topics/foreign-and-security-policy/multilateralism-in-the-red-8485/
https://www.gmfus.org/download/article/20266
https://voxeu.org/system/files/epublication/Economics%20of%20Brexit.pdf
https://rusi.org/explore-our-research/publications/commentary/giving-raf-typhoons-ukraine-would-be-very-expensive-symbolic-gesture