
https://sipri.org/media/press-release/2018/global-military-spending-remains-high-17-trillion

https://www.crisisgroup.org/europe-central-asia/eastern-europe/ukraine/b96-answering-four-hard-questions-about-russias-war-ukraine

https://d2071andvip0wj.cloudfront.net/B004-covid-19-seven-trends.pdf