Iran again launched drone and missile attacks targeting Bahrain and Kuwait on Sunday following new U.S. airstrikes against the Islamic Republic, and threatened a "complete halt" in negotiations to end the war if Washington continues its attacks.

Efforts to reopen the Strait of Hormuz without Iran's oversight has sparked days of crossfire. A multinational maritime body overseen by the U.S. Navy said Saturday it would expand a route near Oman for inbound and outbound traffic.

Israel's defense minister said that Israeli forces had been ordered to prepare for an extended stay in the so-called security zone in southern Lebanon, after Israel and Lebanon agreed on a framework to end hostilities.

Tehran said Sunday it carried out a third day of retaliatory strikes against U.S. attacks on Iranian territory, as both accused the other of violating their fragile ceasefire, straining negotiations meant to end the Middle East war.

Iran on Saturday accused the United States of violating the peace deal agreed to end the Middle East war, after Washington launched strikes on Iranian territory and Tehran responded with attacks on U.S. targets in the Gulf.

The Gulf's top diplomats said on Thursday that dealing with Iran's proxies and missiles was key to lasting peace, and that any trade and investment with Tehran would be reversible and contingent on it respecting its deal with the U.S.

A cargo ship moving through the Strait of Hormuz on a route backed by the United Nations was hit by a projectile Thursday, the British military said, as several tankers made their way out of the channel using the same path.

It was unclear who launched the projectile or the type of vessel that was targeted. The report of a strike came hours after Iran threatened vessels to stop using the route through the strait without Tehran's permission.

Oman's top diplomat said no transit fees would be imposed in the Strait of Hormuz Thursday after Muscat and Tehran, which border the key waterway, had earlier said they were discussing service "costs".

Badr Albusaidi said "future arrangements regarding the Strait do not entail the imposition of any transit fees," during a meeting of Gulf foreign ministers in the Bahraini capital Manama with US Secretary Marco Rubio -- whose administration has repeatedly opposed any fees or tolls.

A series of tankers made their way out of the Strait of Hormuz on Thursday despite threats to shipping from Iran's paramilitary Revolutionary Guard, using a new route close to Oman's shore that has been promoted by a U.N. maritime agency.

The development comes as Iran and the United States are increasingly debating the terms of the interim deal signed last week aimed at permanently ending the Iran war — from getting ships through the narrow mouth of the Persian Gulf to the future of Iran's stockpile of highly enriched uranium.

U.S. Secretary of State Marco Rubio on Thursday warned that Iranian tolls on ships passing the Strait of Hormuz would spread to other waterways, risking "total chaos".

"International waterways do not belong to any nation state. This is a foundational principle in the world today, without which the world would be in total chaos," he told a Gulf Cooperation Council meeting in Bahrain.

The deal between Iran and the United States to end the Middle East war is "America's declaration of defeat", Mohammad Bagher Ghalibaf, the head of the Iranian negotiating team, said on Wednesday.