A fragile ceasefire taking shape through a memorandum of understanding between Iran and the United States is already showing severe strain, as Israeli premier Benjamin Netanyahu declared on Sunday that the Israel Defense Forces will maintain a security zone in southern Lebanon “as long as necessary” to protect northern communities. Hezbollah’s secretary-general Naim Qassem responded hours later that any continued Israeli presence would be confronted, asserting there will be “no safe zone” for Israeli forces and rejecting the notion of an occupied buffer area inside Lebanese territory. The reciprocal escalatory statements come despite a US-Iranian understanding that Washington and Tehran have described as a step toward halting hostilities across the region.

Viewed from Jerusalem, the retention of a roughly ten-kilometre-deep belt in Lebanon is a non-negotiable measure to prevent Hezbollah from rebuilding capabilities after a months-long campaign that Israeli officials say has severely degraded the Shiite movement. Defence Minister Yisrael Katz underscored that troops have “no restrictions” on acting to eliminate threats and would remain in all positions within the security zone, while Netanyahu vowed that Iran will not be permitted to acquire nuclear weapons regardless of political developments. Israeli military sources framed the ongoing operations as essential for northern residents’ return, pointing to the killing of four soldiers in a Hezbollah attack on Friday that triggered extensive airstrikes on targets in Nabatieh and surrounding areas.

Hezbollah and its Iranian backers interpret the Israeli posture as a de facto occupation and a violation of the understanding that the Islamic Republic helped broker. Qassem, speaking through the group’s television channel, described Israeli actions as revealing “humiliation” rather than strength, accusing the Netanyahu government of using negotiations as a cover for intensifying strikes and dictating terms. Iranian foreign ministry spokesman Esmaeil Baghaei blamed Washington for bearing direct responsibility for Israeli raids that killed dozens of civilians, while Iranian officials have linked the durability of any ceasefire to the cessation of Israeli military operations inside Lebanon. Hezbollah-affiliated politicians have also dismissed Lebanese voices calling for a state monopoly on arms, signalling that the militia intends to preserve its arsenal.

On the ground, the conflict’s toll has continued to mount. Lebanon’s health ministry reports that since the escalation on 2 March, Israeli attacks have killed over 4,000 people and wounded more than 12,000, a figure Hezbollah acknowledges includes its fighters. The Lebanese army, meanwhile, is working to defuse large unexploded bombs and is warning residents to delay returning to border villages. In the diplomatic track, low-profile talks are reportedly under way in Switzerland, and President Donald Trump has expressed an expectation of a full ceasefire on all fronts. Yet with Israel asserting it will not withdraw from the security zone and Hezbollah framing any violation as a casus belli, the path to a stable truce remains blocked, leaving the frontier in a volatile equilibrium where each side reserves the right to respond forcibly.