noun
diplomatic relations
Refers to official relations between nations. Often used in news contexts with verbs like 結ぶ (establish), 断つ (sever), or 回復する (restore).
両国は国交を正常化した。
The two countries normalized diplomatic relations.
その事件をきっかけに国交が断絶された。
Diplomatic relations were severed as a result of that incident.