The Lebanon issue is one of the biggest faultlines in the U.S.-Iran Peace Process. The peace talks began in April 2026 in Islamabad; however, the Israeli strikes on Lebanon halted the initial peace process. With a ‘fragile ceasefire’ between Iran and the U.S., and now the Lebanese government and Israel, Lebanon is the proving ground for whether U.S.-Iran reconciliation will lead to regional stability or not. This raises a serious question: How decisive is the ‘Lebanon Question’ in the U.S.-Iran conflict, operating as a proxy ground for conflict?

Lebanon has turned into a battlefield in which the conflict has been evident through the proxy war between Iran and Israel. The Israel–Lebanon ceasefire framework, negotiated through the U.S., includes a proposed phased Israeli withdrawal and Hezbollah’s disarmament clause. However, it was signed without Hezbollah’s inclusion as a formal signatory. This structural exclusion has thus resulted in a short-term instability, with Hezbollah repudiating the agreement as “illegitimate” and continuing resistance operations. On the other hand, Israel struck Southern Lebanon despite the agreement, as Hezbollah opposed the agreement. The ceasefire, therefore, seems to be more symbolic than any concrete security reality. Hezbollah is a strategic deterrent and a bargaining chip for Iran in the wider talks with Washington, and an armed non-state entity to be disarmed at all costs for the U.S. and Israel. This split makes Lebanon more than just an ordinary actor of the peace process. Rather, it is a battleground where the credibility of the peace process is challenged.

The U.S.-Iranian MOU for the region is fragile and has repeatedly failed to prevent escalation in regional conflicts. The U.S.-Iran deal on June 17 aimed to end strikes, reopen maritime routes, and put together a framework for nuclear talks, but it has been tested due to renewed violence between the two. The vagueness of the deal, especially regarding the regional proxies such as Hezbollah, has left the two sides in a “grey zone” in which both sides level accusations of violations and continue to hold formal talks simultaneously. Hence, there’s a paradox in the fact that diplomacy is still going on at high-level forums in neutral cities, such as Doha and Geneva, while Lebanon is in the midst of occasional flare-ups and military operations. The two realities highlight the fact that the peace process is not a way to solve a conflict, but rather a way to manage it, and it cannot detach Lebanon from its strategic orbit.

One of the critical aspects is the political division of Lebanon, which exacerbates foreign involvement in the country and makes any viable settlement nearly impossible. Lebanon cannot be negotiated as a single actor, but it is rather a divided state. The Lebanese government and Hezbollah are at odds when it comes to the clauses of the deal. The ceasefire agreement is dependent on the inter-state agreement and also on achieving an internal consensus, which is lacking. Additionally, the economic and displacement crises further erode Lebanese sovereignty. Although the agreement has been signed, enforcement relies largely on Lebanon’s internal dynamics, and the Israeli actions in future. Lebanon, therefore, complicates the issue between the U.S. and Iran due to the involvement of multiple actors.

An increasingly significant factor is that Lebanon serves as fundamental ground for regional dominance for both Iran and Israel.  Each party tries to leverage the pressure points to gain better negotiating leverage. Iran’s role in Lebanon is important for the state to maintain influence over the region to resist the Israeli military threat. Israel contends that the strikes in southern Lebanon are preventive security measures against Hezbollah’s military infrastructure, and that continued strikes in the area will help alleviate fears of the group’s heavy military buildup. Both states aspire for regional dominance through the power show in Lebanon. It is crucial to strike a balance between these two objectives to avoid a wider regional conflict.

The U.S.-Iran peace process is neither completely broken nor fully successful; one of the major reasons is the persistent instability in Lebanon. Lebanon serves as a pressure valve and a trigger point. The renewed military escalation between Iran and the United States has led to the resurgence of violence in Lebanon and other war theatres. The downside to all of this is powerful: As long as Lebanon’s internal actors align and deal with Israel as a single actor, no peace treaty between Washington and Tehran can have a complete and stable structure. Finally, the Lebanon issue is not just a sideline, but a determining aspect, along with other factors, of whether the U.S.-Iran peace process is any closer to a transition from fragile ceasefires to a lasting regional peace.