Intervention — when a third party steps into a situation and exerts influence or control, often used in political, diplomatic, or organizational contexts.
国際社会が紛争に介入した結果、停戦が実現した。
As a result of international intervention in the conflict, a ceasefire was achieved.
上司が個人的な問題に介入すると、かえって状況が複雑になることがある。
When a boss intervenes in personal matters, the situation can sometimes become more complicated.
彼はその争いにあえて介入しなかった。
He deliberately chose not to intervene in that dispute.