1-2 of about 2 matches for site:www.asiaone.com fundamental customary
https://www.asiaone.com/singapore/transit-rights-international-princip...
and passage through international straits, are widely considered to be part of customary international law. This means
https://www.asiaone.com/singapore/vivian-balakrishnan-iran-foreign-min...
Convention on the Law of the Sea (UNCLOS) and customary international law," he added