noun
hypothetical enemy nation; imaginary enemy state
Used in military, strategic, or political discussions to refer to a country treated as a potential adversary in planning or scenarios, without implying actual hostility.
防衛計画では、仮想敵国を想定した演習が行われる。
In defense planning, exercises are conducted assuming a hypothetical enemy nation.
その小説は、近未来の仮想敵国との戦争を描いている。
The novel depicts a war with a near-future imaginary enemy state.