http://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:52016DC0950&from=en
https://www.brookings.edu/blog/up-front/2018/07/12/as-trump-twists-natos-arm-lets-run-the-math-on-defense-spending/?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=64421876
https://www.ips-journal.eu/index.php?id=293&L=0&tx_news_pi1%5Bnews%5D=4469&tx_news_pi1%5Bcontroller%5D=News&tx_news_pi1%5Baction%5D=detail&utm_source=newsletter&utm_medium=email&utm_campaign=en_798_20200630&cHash=5fed93a9307bee290e266de9e48ae0ec
https://blogs.lse.ac.uk/europpblog/2024/03/06/how-russias-invasion-of-ukraine-rewrote-nordic-defence-policies/