https://rusi.org/sites/default/files/20200324_defence_and_integrated_review_readyforweb.pdf
https://www.crisisgroup.org/europe-central-asia/western-europemediterranean/how-defuse-tensions-eastern-mediterranean
https://www.nao.org.uk/wp-content/uploads/2018/01/PFI-and-PF2.pdf