https://www.brookings.edu/articles/what-did-the-trump-xi-summit-actually-accomplish/
https://blogs.lse.ac.uk/brexit/2021/02/26/future-british-european-security-relations-are-a-matter-of-trust/
https://ecfr.eu/wp-content/uploads/Ambiguous-alliance-Neutrality-opt-outs-and-European-defence.pdf
https://www.nature.com/articles/d41586-022-03580-0?utm_source=Nature+Briefing&utm_campaign=d3d3eec43c-briefing-dy-20221104&utm_medium=email&utm_term=0_c9dfd39373-d3d3eec43c-45594622