https://www.osw.waw.pl/sites/default/files/pw_69_pesco_ang_net.pdf
https://www.brookings.edu/research/a-post-american-europe-and-the-future-of-u-s-strategy/
https://futuros.gob.es/sites/default/files/2023-09/RESILIENTEU2030.pdf
https://www.foreignaffairs.com/articles/2020-02-10/folly-retrenchment?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=83485519