http://www.bankofengland.co.uk/publications/Documents/speeches/2017/speech992.pdf
https://www.progressivepolicy.org/blogs/ppis-trade-fact-of-the-week-military-spending-was-2-3-of-world-gdp-last-year/
https://www.crisisgroup.org/europe-central-asia/eastern-europe/ukraine/271-fraught-path-forward-ukraines-liberated-territories