Israel is already testing the limits of the new U.S.-Iran peace framework.
Hours after Washington and Tehran said they had reached an initial agreement to end the war and reopen the Strait of Hormuz, Israeli Defense Minister Israel Katz said Israeli forces would not withdraw from territory seized in southern Lebanon. Katz also said Israel would keep security zones in Syria and Gaza, turning what looked like a diplomatic breakthrough into a harder question: can the deal hold if Israel is not bound by the Lebanon piece Iran says matters?
The agreement is still short of full implementation. Pakistan says a formal signing is expected Friday in Geneva, while U.S. officials say the text and technical talks are expected to follow. But the Lebanon front is no side issue. Associated Press reporting says the success of the deal depends at least partly on whether Israel and Hezbollah stop fighting, because Tehran has linked the war-ending framework to a halt in Israeli operations against the Iranian-backed group.
Israel Says Withdrawal Is Not Part Of The Deal
The Guardian reported that Katz’s comments were Israel’s first official response after the U.S.-Iran announcement. He said Israeli forces would remain in a broad area captured in southern Lebanon, and he warned that any Iranian attack over Israeli action in Lebanon would draw a major Israeli response.
The Jerusalem Post separately reported that an Israeli source said Israel would not withdraw from southern Lebanon as part of the new U.S.-Iran arrangement. The same report said an IDF source indicated Israel would avoid attacks in Lebanon if Hezbollah respects the ceasefire, while a senior White House source told Walla that an Israeli withdrawal is not included in the U.S.-Iran deal.
That creates a deliberately narrow pause rather than a full settlement. Israel is signaling that it may stop shooting if Hezbollah stops shooting, but it is not giving up the ground it has taken. Iran and Hezbollah can treat that as an unfinished war, even if Washington and Tehran want the broader conflict frozen.
Lebanon Is The Fragile Part Of The Framework
The AP said Israel’s strike on Beirut’s southern suburbs on Sunday nearly derailed the negotiations. That matters because the deal was announced as covering military operations on all fronts, including Lebanon, even though Israel is not a signatory.
The problem is structural. The U.S. and Iran can agree to stop fighting each other, lift a blockade, and begin nuclear and sanctions talks. They cannot automatically force Israel, Hezbollah, or Lebanon into the same rhythm. Israeli officials say they must keep defending the north. Iran has pushed for Lebanon to be part of the war-ending formula. Hezbollah has not yet provided a clear public acceptance that would remove the risk of another exchange.
For Washington, that makes Lebanon the first real stress test of the deal. Hormuz can be demined slowly. Sanctions relief can be tied to benchmarks. Nuclear talks can be stretched over 60 days. A stray rocket, drone strike, or border clash in Lebanon can test the whole framework immediately.
What This Means For The Strait Of Hormuz
The Lebanon dispute also matters for shipping. The U.S.-Iran framework is supposed to reopen the Strait of Hormuz and unwind the U.S. blockade of Iranian ports. But AP reporting says Iran will not begin implementing the agreement until after the formal signing, and the U.S. military has told merchant ships not to attempt transit until explicit direction is given.
That means maritime operators are watching two timelines at once. One is the technical timeline: mines, naval advisories, insurance, escort rules, and port access. The other is political: whether Israel-Hezbollah tensions stay quiet long enough for Iran and the U.S. to move from announcement to execution.
If Israel holds its positions but avoids new strikes, the deal may still limp forward. If Hezbollah fires, Israel responds, and Iran treats that as a breach of the all-fronts promise, the Hormuz reopening could slow again before it really begins.
The Bottom Line
The new angle is not that the U.S.-Iran deal exists. List25 already covered that. The new angle is that Israel is now defining its own red line inside the deal’s weakest clause: Lebanon.
For now, the U.S. can still argue that the framework is alive. Iran can still wait for the formal signing. Markets can still price in a partial reopening of Hormuz. But Israel’s refusal to leave southern Lebanon shows why this agreement is not a clean off-ramp yet. It is a ceasefire architecture with a live military front running straight through it.