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

https://www.gmfus.org/sites/default/files/2022-02/Keil%20-%20NATO%20core%20tasks%20-%20brief%20NEW.pdf

https://www.brookings.edu/wp-content/uploads/2021/04/FP_20210405_china_cyber_power.pdf