https://www.kyivpost.com/article/opinion/op-ed/steven-pifer-ukraine-and-nato-dont-ask-do.html
https://www.nytimes.com/2019/06/06/world/europe/us-defense-spending-nato.html
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/669958/DefenceIndustrialPolicy_Web.pdf