successor state
noun [ C ] uk/səkˈses.ə ˌsteɪt/ us/səkˈses.ɚ ˌsteɪt/
（一个较大的国家分裂之后形成的）继承国
a new smaller country formed after a larger country has been divided up
Russia, Georgia and Ukraine are three of the successor states to the Soviet Union. 俄罗斯、格鲁吉亚和乌克兰是苏联的三个继承国。