noun
a certain country; some country
Used when the speaker does not want to name the country explicitly, often in news or formal contexts. Can imply a specific but unnamed nation.
某国が新たなミサイル実験を行ったと報じられた。
It was reported that a certain country conducted a new missile test.
彼は某国で長年暮らしていた。
He lived in a certain country for many years.