States
Israel views Iran's nuclear programme and regional proxy network as an existential threat and has conducted documented sabotage, cyber, and air operations targeting Iranian and Iran-aligned assets across Iran, Syria, Lebanon, and elsewhere. Its security posture combines US-backed deterrence, an internal multi-layer air-defence network (Iron Dome, David's Sling, Arrow), and willingness to act unilaterally when red lines are crossed. The Mossad, IDF Intelligence Directorate, and Air Force are the principal operational instruments.
Iranian nuclear weapon
Stated red line of decades' standing; declaratory threshold for preventive action.
Hezbollah precision-guided munitions
Sustained build-up of high-accuracy Hezbollah missiles is treated as casus belli.
Mass-casualty attack from any front
Triggers retaliation up the escalation ladder.