https://ecfr.eu/wp-content/uploads/Ambiguous-alliance-Neutrality-opt-outs-and-European-defence.pdf
https://www.whitehouse.gov/wp-content/uploads/2023/04/US-Withdrawal-from-Afghanistan.pdf
https://www.politico.com/news/magazine/2025/12/21/france-europe-security-trump-00700889
https://www.brookings.edu/blog/order-from-chaos/2022/09/16/germany-must-shake-off-its-habit-of-finding-excuses-for-inaction/?utm_campaign=Brookings%20Brief&utm_medium=email&utm_content=226573158&utm_source=hs_email