Israel’s Post-October 7 Doctrine Comes to South Lebanon

Israel is expanding its military presence in southern Lebanon to prevent Hezbollah from reestablishing offensive infrastructure along the Jewish state’s northern frontier. The move follows a sharp escalation in rocket fire, drone attacks, and attempted border infiltrations by Hezbollah’s Radwan Force — the elite unit trained for cross-border raids into Israeli communities.

The new deployment reflects a doctrine forged after the October 7, 2023, Hamas-led attack on southern Israel: Israel will no longer permit heavily armed terrorist forces to entrench themselves along its borders under the cover of deterrence, diplomacy, or unenforced ceasefires. If Hezbollah continues embedding fighters, weapons depots, and launch positions inside civilian areas, southern Lebanon risks becoming another Gaza — marked by prolonged displacement and infrastructure destruction — increasing the pressure on Beirut to confront the Iranian-backed militia operating on its soil.

From Containing Hezbollah to Denying It Access

The Israel Defense Forces (IDF) have steadily expanded ground activity in southern Lebanon since Hezbollah reignited the northern front on March 1 in coordination with Iran. On March 16, Defense Minister Israel Katz confirmed that a ground maneuver is underway, while Israeli troops moved beyond the five positions held under the November 2024 ceasefire agreement and into additional sectors of southern Lebanon. 

Israeli units are now conducting search-and-destroy missions against launch sites, weapons depots, and command infrastructure. Hezbollah, meanwhile, has fired large daily barrages at northern Israel and commanded Radwan operatives, located south of the Litani River, to prepare guided-missile attacks and infiltration attempts.

Israeli officials have not disclosed the full scope of the operation, but multiple reports indicate planning for a large-scale ground operation across southern Lebanon aimed at uprooting Hezbollah from the territory.

The objective is no longer temporary containment. It is geographic denial: removing Hezbollah’s ability to threaten northern Israeli towns from immediate proximity.

Displacement as Leverage

To reduce civilian casualties, Israel issued evacuation warnings across large parts of southern Lebanon. More than 800,000 residents have reportedly fled areas where Hezbollah maintains entrenched military infrastructure. 

Israel has made clear that return will depend on the elimination of threats to northern Israeli communities. That creates direct pressure on Beirut: either enforce sovereignty in the south or absorb prolonged displacement, economic strain, and the gradual erosion of effective control over border territory.

Israeli officials have explicitly linked the southern Lebanon campaign to tactics used against Hamas in Gaza. Villages used to conceal launch positions, tunnels, and weapons stockpiles may face systematic demolition to strip Hezbollah of cover and deny future military reuse. Senior Israeli officials have stated openly that the objective is to do in southern Lebanon what was done in Gaza: destroy the infrastructure that allows an Iranian proxy army to survive inside civilian terrain. 

Lebanon’s Narrowing Strategic Choice

Israel’s former security zone in southern Lebanon, maintained from 1985 to 2000, became costly because Hezbollah retained the strategic initiative. Jerusalem now appears determined not to repeat that model: any sustained deployment will be tied to active degradation of Hezbollah’s military infrastructure, not passive border defense.

For Lebanon, the choice is narrowing quickly. Either the Lebanese state finally acts against Hezbollah’s armed presence, or Israel will continue creating facts on the ground.
This is where Washington matters. Every Israeli strike that weakens Hezbollah creates a rare opening for U.S. diplomacy backed by coercive leverage. The United States should press Beirut to deploy meaningful state authority south of the Litani, enforce disarmament obligations already embedded in existing ceasefire arrangements, and prevent Iran’s most capable Arab proxy from dragging Lebanon deeper toward state failure.

The alternative is a long Israeli military hold in the south — and a deeper transformation of Lebanon’s border zone into a permanent battlefield.

Mark Dubowitz is the CEO of the Foundation for Defense of Democracies (FDD). For more analysis from Mark and FDD, please subscribe HERE. Follow Mark on X @mdubowitz. Follow FDD on X @FDD. FDD is a Washington, DC-based, nonpartisan research institute focusing on national security and foreign policy.