Iran and the United States held their fire Monday, handing Gulf shipping and the oil industry a respite from missile strikes as Donald Trump's UN envoy said the president was "giving talks some space".
Tehran said it had halted retaliatory attacks against Washington's allies in the Middle East, and US ambassador to the United Nations Mike Waltz told "Fox News Sunday" that, while forces remained "locked and loaded", Trump would give negotiations "a little bit of room".
Fighting over the strategic Strait of Hormuz derailed diplomatic efforts between Washington and Tehran, triggering a US air campaign and Iranian reprisals that expanded the conflict to shipping lanes, Gulf countries and military bases across the region.
Prior to Friday, the US military had carried out strikes on Iran for 13 consecutive nights, in the largest rekindling of the almost five-month-old war since an April ceasefire. But Friday, Saturday and Sunday nights passed without bombing.
"Since... our strategy has essentially been retaliatory, we have also halted our retaliatory operations," said Iran's army spokesman Mohammad Akraminia.
Oil prices tumbled on Monday as investors breathed cautious sighs of relief at the pause in combat.
The price of a barrel of international benchmark North Sea Brent crude shed more than seven percent at one point early Monday to briefly drop back below $90, while US counterpart West Texas Intermediate was down four percent at $85.45 a barrel.
Unconfirmed Iranian media reports on Sunday said an oil tanker had been damaged by a sea mine.
- 'One way or the other' -
The lull has revived hopes of a return to negotiations, although American media reported the pause could also reflect pressure on US stockpiles of Patriot interceptors and other defensive weapons.
Trump insisted "we have far more munitions than anyone in the world, and far more than we need" in an interview with The Wall Street Journal.
Waltz also dismissed the idea of a weapons shortage, in a second interview with NBC News' "Meet the Press".
"I want to be crystal clear. The US military -- and I've verified this every which way -- has everything that it needs to conduct this campaign as effectively as it needs to be," he insisted.
Israel's Prime Minister Benjamin Netanyahu is due at the White House on Tuesday, and is expected to urge Trump to continue to take a tough line on Tehran, in particular on its nuclear program.
Iran has long insisted the program is for civilian purposes but the United States and its allies allege it is aimed at developing a weapon.
Also speaking to Fox News, Netanyahu said he fully backed Trump's efforts to shut down Iran's nuclear program.
"If he can do so without returning to intense military fighting, that's fine. Why not? But one way or the other, they have to end their nuclear program, and with a deal or without a deal, that has to come to an end," he said.
Plans to escalate the US campaign have been shelved in part because of shrinking munitions supplies, The New York Times reported, citing two people briefed on the matter.
- New front -
Trump also faces the risk of a wider Middle East war and further shocks to the global economy, the newspaper said.
Trump said on Friday he had not decided whether to return to an all-out operation.
"We're talking to them right now. I think they're getting more and more serious," he told journalists.
The war that Trump once predicted would last four or five weeks is now nearing its fifth month and weighing on the Republican's approval ratings ahead of crucial US midterm elections in November.
On Sunday, locals in Tehran carried on with a normal day, dealing with heavy traffic jams on their way to work, an AFP journalist said.
Shops and restaurants were open as usual as the city suffered a heatwave.
