Diplomatic relations between states; the official ties or interactions between countries (e.g., severing or restoring relations).
両国は国交を断絶した。
The two countries severed diplomatic relations.
国交正常化に向けて交渉が進んでいる。
Negotiations are underway to normalize diplomatic relations.
国交を回復するには時間がかかるだろう。
Restoring diplomatic relations will probably take time.