When the United States and Iran agreed to a memorandum of understanding aimed at ending more than 100 days of conflict, many observers believed the Middle East might finally be moving away from the brink. The agreement included the lifting of the US naval blockade, discussions on sanctions relief, and a 60-day window to negotiate a permanent settlement. Vice President JD Vance publicly defended the deal, arguing that Iran was complying with its commitments and that diplomacy offered the best path forward.
Yet only days after the agreement was announced, the peace process appeared increasingly fragile.
The reason was not a direct clash between Washington and Tehran. Instead, attention quickly shifted to Lebanon, where Israeli military operations against Hezbollah continued despite growing international pressure to preserve regional calm. Critics now argue that Israel has become the most significant obstacle to transforming a temporary ceasefire into a durable peace settlement.
A Deal Built on Regional Stability
The US-Iran agreement was never solely about nuclear issues.
The broader objective was to reduce tensions across the Middle East, reopen maritime routes, restore stability in the Strait of Hormuz, and create conditions for future negotiations. The deal also sought to prevent the conflict from expanding into a wider regional war involving Lebanon, Gulf states, and other actors.
For Washington, the agreement offered a way to end a costly confrontation while reducing pressure on global energy markets. For Iran, it provided an opportunity to ease economic restrictions and avoid further military escalation.
However, the success of such an agreement depended on one crucial condition: all major regional actors had to avoid actions that could reignite hostilities.
Why Critics Point to Israel
According to reports from Reuters, The Guardian, and Al Jazeera, Israeli military operations in Lebanon continued after the ceasefire framework was announced. These operations were justified by Israel as responses to threats from Hezbollah and violations of existing security arrangements. However, critics argue that such actions undermined the political atmosphere necessary for diplomacy to succeed.
The timing is particularly important.
As negotiators prepared for follow-up talks in Switzerland, renewed violence in Lebanon created new tensions and contributed to uncertainty surrounding the negotiations. Eventually, the planned talks were postponed, raising doubts about the future of the peace process.
For many analysts, the issue is not whether Israel has security concerns. The question is whether military escalation at such a sensitive moment made diplomacy significantly harder.
Was Israel Excluded From the Deal?
One reason for Israeli dissatisfaction appears to be that the agreement was largely negotiated between Washington and Tehran.
Several reports suggest Israeli leaders were unhappy with aspects of the arrangement, particularly provisions linked to Lebanon and Hezbollah. Some Israeli officials reportedly viewed the agreement as too favorable to Iran and insufficiently focused on dismantling Tehran’s regional influence.
This created a strategic mismatch.
While Washington increasingly prioritized ending the conflict, parts of the Israeli political establishment appeared focused on maintaining military pressure against Iranian-aligned groups.
As a result, the United States and Israel appeared to be pursuing different timelines and different definitions of success.
JD Vance’s Unusual Warning
One of the most striking developments came when Vice President JD Vance publicly warned Israel against undermining the diplomatic process.
According to Axios, Vance stressed that Israel should not challenge the agreement and urged support for efforts to stabilize the region. Such public criticism is unusual given the traditionally close relationship between Washington and Tel Aviv.
The warning reflected growing concern within parts of the US administration that continued military escalation could derail the agreement before formal negotiations even begin.
When senior American officials start publicly expressing concern about an ally’s actions, it often signals deeper disagreements behind closed doors.
The Lebanon Factor
Lebanon has emerged as the most important battlefield influencing the future of the peace process.
The ceasefire between the United States and Iran may have reduced direct confrontation between those two countries, but clashes involving Hezbollah and Israel continue to threaten regional stability. Reports indicate that some of the deadliest exchanges since the agreement occurred in Lebanon, with both sides accusing each other of violations.
This creates a dangerous cycle.
Israeli strikes provoke responses from Hezbollah. Hezbollah’s actions generate further Israeli retaliation. Each escalation increases pressure on Iran and reduces political space for compromise.
Under such conditions, diplomacy becomes increasingly difficult.
Why a Peace Deal Can Fail Even When the Main Parties Agree
History shows that peace agreements often collapse not because the primary negotiators reject them, but because regional actors pursue different objectives.
The US-Iran agreement faces precisely this challenge.
Washington wants stability.
Iran wants sanctions relief and economic recovery.
Israel wants security guarantees and the weakening of Hezbollah.
These objectives overlap in some areas but clash in others.
As long as these competing priorities remain unresolved, every military incident risks becoming a diplomatic crisis.
Is Israel the Only Side Responsible?
A balanced assessment requires acknowledging that responsibility does not lie with one actor alone.
Hezbollah attacks, Iranian regional policies, American strategic decisions, and broader regional rivalries all contribute to instability. Reports indicate that recent violence followed deadly incidents involving both Israeli and Hezbollah forces.
However, critics specifically focus on Israel because its actions occurred at a moment when negotiators were attempting to transform a ceasefire into a permanent settlement.
From this perspective, the concern is not simply military activity itself but its timing and political consequences.
Losing the Last Chance for Diplomacy
The greatest danger is that continued escalation could destroy what may be the best opportunity for a broader regional settlement in years.
The reopening of maritime routes, the lifting of the blockade, and the start of negotiations created a rare diplomatic opening. Yet every new military confrontation reduces trust and strengthens hardliners on all sides.
If the peace process collapses, many observers will likely ask whether diplomacy failed because the agreement was flawed—or because regional actors were unwilling to give diplomacy enough time to succeed.
Military operations in Lebanon
The emerging debate is not whether Israel has legitimate security concerns. Rather, it is whether continued military operations in Lebanon have made it significantly harder to convert a temporary US-Iran ceasefire into a lasting peace agreement.
Critics argue that Israel has become the main obstacle because its actions have complicated negotiations, increased regional tensions, and contributed to the postponement of key diplomatic meetings. Supporters of Israel counter that security threats leave little room for restraint.
What is clear is that the future of the peace process now depends not only on Washington and Tehran but also on whether regional actors can resist the temptation to pursue military solutions while diplomats are still trying to negotiate political ones.
