https://www.nytimes.com/2019/06/06/world/europe/us-defense-spending-nato.html
https://www.cesifo-group.de/DocDL/ifoDD_18-01_03-09_Ochsner.pdf
https://ecfr.eu/wp-content/uploads/2024/02/Wars-and-elections-How-European-leaders-can-maintain-public-support-for-Ukraine.pdf