Can mediators save the Iran deal despite the Lebanon poison pill?

The "Islamabad Memorandum" aimed to de-escalate tensions between Iran and the U.S. by ending hostilities and reopening the Strait of Hormuz, but Iran swiftly closed the strait again due to a clause concerning Lebanon, signaling potential issues in the deal's implementation. This move highlights the complexities in international diplomacy, where regional factors can derail even the most carefully negotiated agreements. The situation underscores the challenges mediators face in navigating deeply entrenched geopolitical tensions and the importance of addressing all regional concerns to sustain broader international accords.