act of war
Hostile nation's attack
An act of war is an action by one nation severe enough to justify military retaliation by another—attacking ships, violating airspace, killing soldiers.
The phrase often appears in debates about what crosses the line: Is a cyberattack on infrastructure an act of war?
Figuratively, any aggressive move that invites retaliation: Stealing my parking spot is an act of war.
Forcible entry into territory
- assaultViolent offensive act
- strikeForceful impact or stoppage
- bombardmentSustained projectile assault
- raidSudden armed incursion
incursion · onslaught · blitzkrieg · offensive · preemptive strike · ambush · attack · provocation
Justification for armed conflict
- ultimatumNon-negotiable final terms
- provocationAct that triggers response
- breachBreaking of agreement
- violationBreaking of rules
sovereignty · formal declaration · international law · Geneva Conventions · UN Charter · Article 5 · just cause · pretext
Punitive international restrictions
- embargoOfficial prohibition on trade
- sovereigntySupreme independent authority
- allianceFormal union of parties
- treatyBinding pact between nations
sphere of influence · balance of power · deterrence · hegemony · superpower · annexation · blockade · regime change
Armed hostile engagement
- battlefieldCombat engagement area
- siegeEncirclement forcing surrender
- campaignOrganized effort toward goal
- engagementCommitment to wed or attend
bombardment · artillery · naval blockade · troops · mobilization · occupation · military operation · ground invasion
Punitive response to injury
- reprisalPunitive action in return
- counterattackOffensive response to aggression
- sanctionsPunitive international restrictions
- retributionPunishment for wrongdoing
counterstrike · proportional response · measured response · armed response · tit-for-tat · escalation · de-escalation · ceasefire
Deliberate disruption of operations
- espionageCovert intelligence gathering
- subversionUndermining established authority
- cyberattackMalicious digital intrusion
- assassinationMurder of a prominent figure
false flag · covert operation · proxy forces · destabilization · infiltration · disinformation · propaganda · election interference
invasion
Forcible entry into territory
- assaultViolent offensive act
- strikeForceful impact or stoppage
- bombardmentSustained projectile assault
raid · incursion · onslaught · blitzkrieg · offensive · preemptive strike · ambush · attack · provocation · first strike
casus belli
Justification for armed conflict
- ultimatumNon-negotiable final terms
- provocationAct that triggers response
- breachBreaking of agreement
violation · sovereignty · formal declaration · international law · Geneva Conventions · UN Charter · Article 5 · just cause · pretext
sanctions
Punitive international restrictions
- embargoOfficial prohibition on trade
- sovereigntySupreme independent authority
- allianceFormal union of parties
treaty · sphere of influence · balance of power · deterrence · hegemony · superpower · annexation · blockade · regime change · buffer state
combat
Armed hostile engagement
- battlefieldCombat engagement area
- siegeEncirclement forcing surrender
- campaignOrganized effort toward goal
engagement · bombardment · artillery · naval blockade · troops · mobilization · occupation · military operation · ground invasion · amphibious assault
retaliation
Punitive response to injury
- reprisalPunitive action in return
- counterattackOffensive response to aggression
- sanctionsPunitive international restrictions
retribution · counterstrike · proportional response · measured response · armed response · tit-for-tat · escalation · de-escalation · ceasefire · armistice
sabotage
Deliberate disruption of operations
- espionageCovert intelligence gathering
- subversionUndermining established authority
- cyberattackMalicious digital intrusion
assassination · false flag · covert operation · proxy forces · destabilization · infiltration · disinformation · propaganda · election interference · sleeper cell
- hostilityanimosity, hostility, antagonism, belligerence, malice
act of warpeace offering
Gesture to end conflict
peace talks · treaty negotiation · diplomatic mission · diplomatic engagement · goodwill gesture
act of warpeace treaty
Formal end to hostilities
peace accord · ceasefire · armistice · truce · reconciliation
act of warpeace offering
Gesture to end conflict
gesture of goodwill · olive branch · friendly gesture · diplomacy · humanitarian aid
war, act, action, exact, active, actor, acting, activity, react