Following World War II, the United States began implementing an informal program to protect and promote the "rights and freedoms of navigation and overflight guaranteed to all nations under international law."
Aceves, William J.
"Diplomacy at Sea: U.S. Freedom of Navigation Operations in the Black Sea,"
Naval War College Review: Vol. 46
, Article 6.
Available at: https://digital-commons.usnwc.edu/nwc-review/vol46/iss2/6