The United States and Iran signed a preliminary cease-fire memorandum of understanding on June 15, 2026 [1], to halt hostilities in the Gulf.

This agreement is critical because it aims to reopen the Strait of Hormuz, one of the world's most vital shipping lanes for global oil and trade. While the deal stops immediate fighting, it does not resolve the underlying nuclear disputes that have long strained relations between the two nations.

President Donald Trump and senior Iranian officials coordinated the agreement to end the ongoing Gulf war [2]. The memorandum focuses on the cessation of combat operations and the restoration of maritime traffic in the Gulf of Oman and the Strait of Hormuz [3]. A formal signing ceremony is expected to take place in Geneva, Switzerland [4].

Under the terms of the memorandum, both parties have entered a 60-day negotiation period [1] to work toward a lasting peace agreement. However, significant hurdles remain. The two sides have not reached a consensus on Iran's uranium enrichment levels, or the lifting of U.S. sanctions [5].

Reports on the scope of the cease-fire vary. Some sources said the deal includes provisions to end fighting in Lebanon [6], while other reports said the agreement is strictly limited to the Gulf and nuclear issues [7]. There is also conflicting information regarding the transparency of the deal, with some reports saying the specific terms remain secret [8] and others identifying the primary disputes over sanctions and nuclear activity [1].

Despite these contradictions, the immediate priority for both governments is the stabilization of the region's waters to avoid a return to full-scale conflict [9]. The 60-day window serves as a diplomatic bridge to determine if a comprehensive treaty is possible [1].

“The agreement halts hostilities in the Gulf but leaves critical disputes over nuclear enrichment and sanctions unresolved.”

The memorandum represents a tactical shift from military confrontation to diplomatic maneuvering. By separating the immediate need for maritime security in the Strait of Hormuz from the complex nuclear deadlock, the U.S. and Iran have created a temporary cooling-off period. The success of this deal depends on whether the 60-day window can produce a compromise on uranium enrichment, as the lack of a nuclear resolution leaves a primary catalyst for future conflict intact.