
https://dserver.bundestag.de/btd/20/057/2005700.pdf

https://rusi.org/explore-our-research/publications/commentary/giving-raf-typhoons-ukraine-would-be-very-expensive-symbolic-gesture

https://dam.gcsp.ch/files/doc/ssa-2022-issue22?_gl=1*1mzrz83*_ga*NDgwMzA0ODA2LjE2NDQzNDk0NTk.*_ga_Z66DSTVXTJ*MTY0NDM0OTQ1OC4xLjAuMTY0NDM0OTQ1OC4w