gunboat diplomacy
noun [ U ] disapproving uk/ˌɡʌn.bəʊt dɪˈpləʊ.mə.si/ us/ˌɡʌn.boʊt dɪˈploʊ.mə.si/
（强国以武力威胁弱国的）炮舰外交
the use of military threats by a strong country against a weaker country in order to make that country obey it
Compare: power politics