https://www.ips-journal.eu/topics/foreign-and-security-policy/security-in-limbo-7255/
https://www.politico.com/f/?id=00000189-25c9-d0a8-a59b-ffd9f39f0000
https://www.atlanticcouncil.org/in-depth-research-reports/report/implementing-natos-strategic-concept-on-china/?mkt_tok=NjU5LVdaWC0wNzUAAAGJ_uISKKmK5ChQmYqp3FIy22EKhsuSDhecKS0SsZNJ1sV3V2fpPArSTKmn88kbPdZnR2NjVs1-ceAcrug_2H6hqtyE2xjvAZwEcKPyr82mlu0
https://www.nao.org.uk/wp-content/uploads/2017/07/The-Customs-Declaration-Service.pdf