A systems-level analysis of Hezbollah, border security, sovereignty, territorial control, post–October 7 escalation, and the mathematics of a possible Israel–Lebanon equilibrium 1. The conflict in one sentence The Israel–Lebanon problem is not only a border dispute. It is a four-layer security system involving Israeli northern-border safety, Lebanese sovereignty, Hezbollah’s independent military power, and Iran’s regional deterrence architecture. That is why it keeps returning. 2. The historical structure: 50-year arc The modern Israel–Lebanon security problem has passed through several phases: 1978: Israel entered southern Lebanon after Palestinian militant attacks, and UNIFIL was created that year to monitor withdrawal and stability in the south. Reuters notes UNIFIL has been deployed since 1978 and still operates in the area. 1982–2000: Israel invaded Lebanon in 1982, then maintained a long security zone in southern Lebanon until its withdrawal in 2000.…