https://pism.pl/webroot/upload/files/Biuletyn/PISM%20Bulletin%20no%20174%20(2091)%208%20November%20%202022.pdf
https://www.bruegel.org/wp-content/uploads/2021/10/Storms-Ahead_AGH_chp6.pdf
https://www.kyivpost.com/article/opinion/op-ed/steven-pifer-ukraine-and-nato-dont-ask-do.html