Intervene means to step in or get involved in a situation in order to alter its course or prevent further harm.
Related terms
Mediation: The act of helping parties involved in a dispute reach an agreement through negotiation facilitated by a neutral third party.
Ceasefire: A temporary halt or suspension of fighting during a war or conflict.
Humanitarian Aid: Assistance provided by individuals or organizations to people who are suffering from natural disasters, conflicts, or other emergencies.