http://www.ecfr.eu/page/-/EU_TURKEY_POWER_AUDIT.pdf
https://www.politico.eu/article/turkey-recep-tayyip-erdogan-the-master-haggler-of-world-politics-at-vilnius-nato-summit/
https://blogs.letemps.ch/nadia-sikorsky/2021/02/08/les-limites-de-la-neutralite/
https://fam.state.gov/fam/11fam/11fam0720.html