Iran sent its response to the latest U.S. ceasefire proposal via Pakistani mediators and wants negotiations to focus on permanently ending the war, but U.S. President Donald Trump quickly rejected it as “TOTALLY UNACCEPTABLE!” without providing details.

Iran seeks to end the war on all fronts, including in Lebanon, where Israel is fighting the Iranian-backed Hezbollah militant group, and to ensure the security of shipping, state TV said. Washington’s latest proposal addressed a deal to end the war, reopen the Strait of Hormuz and roll back Iran’s nuclear program.

Trump earlier on social media accused Tehran of “playing games” with the United States for nearly 50 years, adding: “They will be laughing no longer!”

He’s giving diplomacy “every chance we possibly can before going back to hostilities,” the U.S. ambassador to the United Nations, Mike Waltz, told ABC News earlier.

Iran’s new supreme leader, Mojtaba Khamenei — who has not been seen or heard from publicly since the war began on Feb. 28 — “issued new and decisive directives for the continuation of operations and the powerful confrontation with the enemies” while meeting with the head of the joint military command, the state broadcaster reported, with no details.

Drone attacks target Gulf Arab nations

A fragile ceasefire that began on April 8 — and was later extended by Trump — was tested on Sunday when a drone ignited a small fire on a ship off Qatar, and the United Arab Emirates and Kuwait reported drones entering their airspace. The U.A.E. said it shot down two drones and blamed Iran. No casualties were reported, and no one immediately claimed responsibility.

Qatar’s Foreign Affairs Ministry called the ship attack a “dangerous and unacceptable escalation that threatens the security and safety of maritime trade routes and vital supplies in the region.” The United Kingdom Maritime Trade Operations Centre gave no details about the ship’s owner or origin.

Kuwait Defence Ministry spokesperson Brig.-Gen. Saud Abdulaziz Al Otaibi said forces responded to drones but did not say where they came from.

Iran and armed allied groups like Hezbollah in Lebanon have used drones to carry out hundreds of strikes since the war began with U.S. and Israeli attacks on Iran.

‘Full readiness’ to protect nuclear sites

Trump has reiterated threats to resume full-scale bombing if Iran does not accept an agreement to reopen the Strait of Hormuz and roll back its nuclear program. Iran has largely blocked the strategic waterway that’s key to the global flow of oil, natural gas and fertilizer since the war began, rattling world markets.

The U.S. military in turn has blockaded Iranian ports since April 13, saying it has turned back 61 commercial vessels and disabled four. On Friday, it struck two Iranian oil tankers it said were trying to breach the blockade. Iran’s Revolutionary Guard navy says any attack on Iranian oil tankers or commercial vessels would be met with a “heavy assault” on U.S. bases in the region and enemy ships.

Another sticking point in negotiations is Iran’s highly enriched uranium. The United Nations nuclear agency says Iran has more than 440 kilograms enriched up to 60 per cent purity, a short, technical step from weapons grade.

How close Iran was to making a nuclear bomb

U.S. President Donald Trump has justified war with Iran by saying the country was two weeks away from having a nuclear weapon. For The National, CBC’s Eli Glasner breaks down those claims and how close Iran really was to building a nuke.

In an interview posted late Saturday, an Iranian military spokesperson said forces were on “full readiness” to protect sites where uranium is stored.

“We considered it possible that they might intend to steal it through infiltration operations or heli-borne operations,” Brig.-Gen. Akrami Nia told the IRNA news agency.

Israeli Prime Minister Benjamin Netanyahu, in an excerpt from an interview with CBS News airing on Sunday, said the war isn’t over because the enriched uranium needs to be taken out of Iran. “Trump has said to me, ‘I want to go in there,’ and I think it can be done physically,” he said.

Russian President Vladimir Putin said on Saturday that Moscow’s proposal to take enriched uranium from Iran to help negotiate a settlement remains on the table.

The majority of Iran’s highly enriched uranium is likely at its Isfahan nuclear complex, the International Atomic Energy Agency director general told The Associated Press last month. The facility was hit by U.S.-Israeli airstrikes in the 12-day war last year and faced less intense attacks this year.

Iran warns against French-British involvement

Iran’s deputy foreign minister warned against a planned French-British effort that aims to support maritime security in the Strait of Hormuz after hostilities are over.

“The presence of French and British vessels, or those of any other country, for any possible co-operation with illegal U.S. actions in the Strait of Hormuz that violate international law will be met with a decisive and immediate response from the armed forces,” Kazem Gharibabadi said on social media.

French President Emmanuel Macron responded by saying it won’t be a military deployment but an international mission to secure shipping once conditions allow.

Several attacks against ships in the Persian Gulf have occurred over the past week, and a U.S. effort to “guide” ships through the strait was quickly paused.

South Korea announced initial findings from an investigation that said two unidentified objects struck the South Korean-operated vessel HMM NAMU about one minute apart while it was anchored in the strait last week, causing an explosion and fire.

A Foreign Affairs Ministry spokesperson said officials have yet to determine who was responsible.