
https://ecfr.eu/wp-content/uploads/Ambiguous-alliance-Neutrality-opt-outs-and-European-defence.pdf

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

https://theconversation.com/habra-mas-guerras-y-disturbios-en-2024-estos-son-los-5-puntos-calientes-que-hay-que-vigilar-220495