noun
false flag operation
Military term for a covert operation designed to appear as though carried out by another entity.
その攻撃は偽旗作戦だったと疑われている。
The attack is suspected of having been a false flag operation.
Compound of 偽 (false) + 旗 (flag) + 作戦 (operation). Likely a calque from English 'false flag operation'.