noun
act of aggression
Refers to a concrete action that constitutes an invasion or aggressive military act, often used in political or legal contexts.
その軍事行動は明らかな侵略行為だ。
That military action is clearly an act of aggression.
侵略 is the broader concept of invasion or aggression, while 侵略行為 specifies a concrete act or instance of aggression.
Compound of 侵略 (invasion, aggression) and 行為 (act, deed).