diplomatic relations
拓展：
漢英大詞典
外交關系升格
upgrade diplomatic relations;
斷絕外交關系
sever diplomatic relations;
恢復外交關系
resume diplomatic relations;
建立外交關系
establishment of diplomatic relations;
建立大使級的外交關系
establish diplomatic relations at ambassadorial level;
中斷外交關系
suspend diplomatic relations