signatory country; party to a treaty
Refers to a country that has formally joined a treaty. Used in diplomatic and legal contexts.
The number of signatory countries to the treaty exceeds 50.
The parties to the treaty hold regular meetings.
署名国 emphasizes the act of signing a treaty, while 条約加盟国 focuses on membership after ratification or accession.
Compound of 条約 (treaty) + 加盟 (participation, affiliation) + 国 (country).