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diplomatic relations
両国は長年にわたり外交関係を維持してきた。
The two countries have maintained diplomatic relations for many years.
外交関係が断絶すると貿易にも影響が出る。
When diplomatic relations are severed, trade is also affected.
新政権と外交関係を樹立する方針だ。
The policy is to establish diplomatic relations with the new government.