http://blogs.lse.ac.uk/brexit/2018/09/25/brexit-has-become-unnegotiable-theresa-may-has-a-constitutional-duty-to-admit-that-truth/
http://www.ecfr.eu/article/commentary_the_brexit_threat_to_britains_defence_industry
https://www.euronews.com/2019/10/19/european-countries-halted-arm-exports-to-turkey-but-why-haven-t-they-done-the-same-for-sau