
https://www.ips-journal.eu/topics/foreign-and-security-policy/between-existence-and-expediency-7498/

https://ukandeu.ac.uk/unpacking-the-iran-saudi-agreement/?mc_cid=71c929e541&mc_eid=815b1928ec

https://www.nao.org.uk/wp-content/uploads/2017/07/The-Customs-Declaration-Service.pdf