Gunboat diplomacy

Gunboat diplomacy is the pursuit of foreign policy objectives with the aid of conspicuous displays of naval power, implying or constituting a direct threat of warfare should terms not be agreeable to the superior force.

The term originated in the 19th century, during the age of imperialism, when Western powers, especially the United Kingdom, France, Germany and the United States would use their superior military capabilities, particularly their naval assets, to intimidate less powerful nations into granting concessions. The mere presence of warships off a country's coast was often enough to have a significant effect, making the actual use of force rarely necessary.