
https://www.ips-journal.eu/topics/foreign-and-security-policy/belarus-half-hearted-war-participation-5883/?utm_campaign=en_993_20220419&utm_medium=email&utm_source=newsletter

https://www.brookings.edu/blog/order-from-chaos/2021/03/30/the-us-military-must-plan-for-encounters-with-private-military-companies/?utm_campaign=Brookings%20Brief&utm_medium=email&utm_content=118778216&utm_source=hs_email

https://publications.parliament.uk/pa/ld201719/ldselect/ldeucom/16/1603.htm