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WASHINGTON — A day after the United States and Iran agreed to a two-week ceasefire, the truce showed signs of strain Wednesday as Iranian leaders accused Americans of violating the agreement and reports emerged that Tehran had moved to restrict traffic through the Strait of Hormuz.

The developments tested President Trump’s ability to parlay a fragile pause in fighting into a lasting peace deal with a country he has spent weeks threatening to destroy, and raised questions about whether the Trump administration had the diplomatic leverage to hold the deal together.

The White House sought to project confidence about the ceasefire, but the fragile deal grew shakier after Israel carried out its largest attack against Hezbollah in Lebanon since the conflict began. Iran said the strikes by the U.S. ally amounted to a breach of the ceasefire terms, even as Trump and Israeli Prime Minister Benajmin Netanyahu maintained that Lebanon was not subject to the agreement.

“The big issue seems to be that the two sides can’t agree on what the agreement is,” said Michael Rubin, an expert on Iran at the American Enterprise Institute. At best, he said, the two sides had secured a “tactical pause.”

Iranian Foreign Minister Abbas Araghchi said the United States must choose between a ceasefire or “continued war via Israel.

“It cannot have both,” Araghchi wrote on X. “The world sees the massacres in Lebanon. The ball is in the U.S. court, and the world is watching whether it will act on its commitments.”

Whether Iran will draw a red line over Lebanon could become a key question. The Wednesday back-and-forth represented “threshold-testing” of Iran and whether it will be willing to reengage the United States in conflict over the issue, said Ross Harrison, senior fellow at the Middle East Institute.

The parties’ prospects for reaching an agreement — and what Trump’s options become for declaring success — will depend on how the ceasefire goes in the coming days, Harrison said.

“There’s some room here … if [the Iranians] see that negotiations are real and not a pretext for further attacks,” he said. “A lot of what the United States can get depends on what the United States is willing to give — not just in terms of the points of their plan, but also in terms of the signaling that they too have an interest in de-escalating.”

Reports that Iran had moved to restrict traffic through the Strait of Hormuz, a crucial waterway whose opening was central to the truce negotiations, further complicated the ceasefire.

“Any vessel trying to travel into the sea … will be targeted and destroyed,” the Iranian navy told shipping vessels, Fars News reported. The news agency is aligned with the Islamic Revolutionary Guard Corps.

At a news briefing Wednesday, White House Press Secretary Karoline Leavitt said Trump was aware of reports that the Strait of Hormuz had been closed, a move she called both “completely unacceptable” and “false.” She added that the president expects the waterway will be “reopened immediately, quickly and safely” during the ceasefire.

Leavitt sidestepped questions about who currently controls the oil route.

Earlier in the day, at a Pentagon briefing, Defense Secretary Pete Hegseth told reporters that “commerce will flow” through the strait, but did not say whether U.S. warships would be escorting vessels through the waterway. Joint Chiefs of Staff Chairman Gen. Dan Caine, who stood next to Hegseth, was asked whether the strait was open. He said: “I believe so.”

Hegseth emphasized that Iran should keep its end of the bargain or face the consequences.

He said the U.S. military plans to maintain a presence in the region to ensure Iranian compliance, saying American troops are ready to “go on offense and restart operations at a moment’s notice” if the truce broke down.

“We’ll be hanging around,” Hegseth said. “We are going to make sure Iran complies with this ceasefire and then ultimately comes to the table and makes a deal.”

The warning came as several Persian Gulf nations reported Iranian missile and drone attacks on their territories despite the ceasefire. Kuwait said its air defenses intercepted drones, while Bahrain reported that an Iranian attack has sparked a fire at one of its facilities.

Hegseth downplayed the continued Iranian attacks in the region, saying that “it takes time sometimes” for ceasefires to take hold, but advised Iran to “find a way to get a carrier pigeon to their troops in remote locations” and ensure compliance moving forward.

Israel, meanwhile, carried out its largest strike against Hezbollah since the militant group began launching rockets in solidarity with Iran last month. Lebanese health authorities said hundreds were killed and wounded in the Israeli strikes.

Trump and Israeli Prime Minister Benjamin Netanyahu have maintained that Lebanon is not subject to the ceasefire agreement. Leavitt reiterated that stance, telling reporters that “Lebanon was not part of the ceasefire” and that it had been relayed to all parties.

Asked whether Trump would want to add Lebanon to the agreement in the future, Leavitt said that the matter “will continue to be discussed but that “at this point in time they are not included.”

More than a dozen European heads of state called on “all sides” to cease fire, including in Lebanon. In a Wednesday statement, they urged the parties to move quickly in diplomatic talks.

“The goal must now be to negotiate a swift and lasting end to the war within the coming days,” they said in the statement, which was signed by French President Emmanuel Macron, Italian Prime Minister Giorgia Meloni and German Chancellor Friedrich Merz, along with Japanese Prime Minister Sanae Takaichi as well as other European leaders.

Pakistani Prime Minister Shehbaz Sharif, who helped broker the ceasefire, wrote on X that ceasefire violations had been reported at “a few places across the conflict zone” and urged all parties to exercise restraint. He did not detail the violations but said the attacks “undermine the spirit of the peace process.”

The situation in the Strait of Hormuz underscores how much remains uncertain about the agreement between the United States and Iran. The full terms of the ceasefire have not been publicly disclosed, and Trump wrote on his social media website that the “only group of meaningful ‘POINTS’ that are acceptable to the United States” will be discussed behind closed doors.

Trump also seemed to take issue with the 10-point peace plan that Iran publicly released Wednesday. He said that there are terms being floated by people who have “absolutely nothing to do” with the negotiations between the United States and Iran. He said that “in many cases, they are total Fraudsters, Charlatans, and WORSE.”

Leavitt declined to offer details about the working proposal being negotiated, saying the talks will take place privately. Both Leavitt and Hegseth, however, mentioned that the U.S. wants to ensure Iran does not have stockpiles of enriched uranium, the fissile material that is key in developing nuclear weapons.

“This is on the top of the priority list for the president and his negotiating team as they head into the next round of discussions,” Leavitt said.

Hegseth told reporters earlier in the day that Iran may “hand it over.” If they don’t, he said, “we will take it out, or if we have to do something else ourselves like we did [with] Midnight Hammer or something like that, we reserve that opportunity.” He was referring to the 12-day war against Iran in June.

Leavitt reiterated that administration officials “hope it will be through diplomacy,” but left open the possibility that the uranium could be retrieved through ground operations.

There is probably negotiating room over enrichment, said Harrison of the Middle East Institue, while Iran may be less flexible on the Strait of Hormuz. The United States needs a resolution more quickly than Iran, he added.

“Time is their friend, not a friend of Donald Trump’s,” Harrison said.

Iranian President Masoud Pezeshkian has laid out terms for ending the war with the United States and Israel in what analysts say is a possible sign of de-escalation from Tehran as the US-Israel war on Iran entered its 13th day on Thursday.

In a post on Wednesday on social site X, Pezeshkian said he had spoken to his counterparts in Russia and Pakistan, and that he had confirmed “Iran’s commitment to peace”.

“The only way to end this war – ignited by the Zionist regime & US – is recognizing Iran’s legitimate rights, payment of reparations, and firm int’l guarantees against future aggression,” Pezeshkian wrote.

This is a rare posture from Tehran, which has maintained a defiant stance and initially rejected any possibility of negotiations or a ceasefire when war broke out nearly two weeks ago.

Pezeshkian’s statement comes as pressure mounts on the US to halt what has become a very costly mission. Analysts say speculation from Washington that Iran would quickly submit after the killing of Supreme Leader Ayatollah Ali Khamenei were misguided.

Tehran is likely going to determine the end of this war, not the US or Israel, because of its ability to inflict economic pain broadly, they say.

Amid a military pummelling by the US and Israel, Iran has launched heavy retaliatory strikes at US assets and other critical infrastructure in Gulf countries, upsetting global supplies. It has also adopted what analysts call “asymmetric” tactics – such as disrupting the critical Strait of Hormuz and threatening US banking-linked entities – to inflict as much economic pain on the region and wider world as it can.

This is what we know about Pezeshkian’s stance and what the pressures are on both sides to draw the conflict to a close, quickly.

What has the war cost so far?

Economically, both sides have weaponised energy. Israel first targeted Iran’s oil facilities in Tehran on March 8, prompting an outcry from global health experts over the potential risk of air and water pollution.

Iran has, meanwhile, tightened its chokehold on the Strait of Hormuz shipping route – the only route to open sea for oil producers in the Gulf – with its military promising on Wednesday that it has the capabilities to wage a long war that could “destroy” the world economy.

Attacks on ships in the strait, through which about 20 percent of global oil and gas traffic normally passes, have effectively closed the route.

Oil prices rocketed above $100 per barrel late last week, up from around $65 before the war, with ordinary buyers feeling the increases at pumps in the US, Europe and parts of Africa.

On Wednesday, Iran upped the ante, saying it would not allow “a litre of oil” to pass through the strait and warned the world to expect a $200-per-barrel price tag.

“We don’t know how quickly it’ll revert back,” Freya Beamish, chief economist at GlobalData TS Lombard, told Al Jazeera. “We do think it’ll revert back to $80 in due course, but the ball is to some degree in Iran’s court,” she said, adding that because Iran needs oil revenue, the price hikes are expected to be time-limited.

The International Energy Agency agreed on Wednesday to release 400 million barrels from the emergency reserves of several member states but it is not yet clear what impact that will have, nor how quickly this quantity of oil can be released.

Tehran has also been accused of directly attacking oil facilities in neighbouring countries this week. Iraq shut all its oil port operations on Thursday after explosive-laden Iranian “drone” boats appeared to have attacked two fuel tankers in Iraqi waters, setting them ablaze and killing one crew member.

A drone was filmed striking Oman’s Salalah oil port on Wednesday, although Tehran has denied involvement.

What are Iranian officials saying about ending the war?

There has been conflicting messaging from the Iranian leadership.

Iran’s elite army unit and parallel armed force, the Islamic Revolutionary Guard Corps (IRGC), continues to show defiance, issuing threats and launching attacks on Israel and US military assets and infrastructure in neighbouring Gulf countries.

However, the political leadership has appeared more inclined towards diplomacy, analysts say. On Wednesday, President Pezeshkian said that ending the war would take the US and Israel recognising Iran’s rights, paying Iran reparations – although it’s unclear how much is being asked for – and providing strong guarantees that a future war will not be waged.

In a video recording last week, he also apologised to neighbouring countries for the strikes and promised that Iran would stop hitting its neighbours as long as they do not allow the US to launch attacks from their territory.

“I personally apologise to the neighbouring countries that were affected by Iran’s actions,” the president said, adding that Tehran was not looking for confrontations with its neighbours.

However, it is not known how much sway the political leadership has over the IRGC. Hours after the president’s apology last week, air defence sirens went off in Saudi Arabia, Qatar, the UAE and Bahrain, as strikes continued on the Gulf.

So, what is Iran’s actual position?

“Iran wants to go to the end to make sure that the United States and Israel never attack Iran again … so this has to be the final battle,” Al Jazeera’s Resul Serdar Atas explained.

Indeed, the IRGC sees this as an existential war, but the timing of Pezeshkian’s statement about ending the conflict also shows Tehran is pressured economically, politically and militarily, Zeidon Alkinani of Qatar’s Georgetown University told Al Jazeera.

“These differences and divisions [between IRGC and political leaders] always existed even prior to this war but we may notice it now more, given the fact that the IRGC believes that it has the right to take the front seat in leading this regional war, which is why a lot of the statements and positions are contradicting with the official ones from Pezeshkian,” he said.

The IRGC reports directly to Iran’s Supreme National Security Council (SNSC) and not to the country’s political leadership. That council is led by Ali Larijani, a top politician and close aide to the late supreme leader, Ali Khamenei, who analysts describe as a “hardliner”.

In a post on X on Tuesday, Larijani responded to threats from Trump about attacks on the Strait of Hormuz, saying: “Iranian people do not fear your hollow threats; for those greater than you have failed to erase it … So beware lest you be the ones to vanish.”

The newly elected supreme leader, Mojtaba Khamenei, was once in the IRGC and was put forward by the unit as the next ayatollah after his father was killed on the first day of the war, analysts say. He is thus not expected to follow the reformist, diplomatic ideals of President Pezeshkian and other political leaders which his father managed to marry with the IRGC militarised stance, they say.

What do the US and Israel say about ending the war?

There have also been conflicting messages from the Trump administration and Israel regarding when the war mission on Iran, codenamed Operation Epic Fury, is likely to end.

Trump told US publication Axios on Wednesday that the war on Iran would end “soon” because there’s “practically nothing left to target”.

“Anytime I want it to end, it will end,” he added. He had said earlier on Monday that “we’re way ahead of our schedule” and that the US had achieved its goals, even as speculation mounts about a possible US ground mission.

On the other hand, Israel’s Defence Minister Israel Katz said on Wednesday that the war would go on “without any time limit, for as long as necessary, until we achieve all the objectives and decisively win the campaign”.

Analysts say Trump’s stance that the conflict will be quick reflects increasing pressure on his administration ahead of upcoming mid-term elections in November.

Trump’s advisers privately told him this week to find a quick end to the war and avoid political backlash, according to reporting by The Wall Street Journal. That came as polls from Quinnipiac University and The Washington Post suggested that most Americans are opposed to the war in Iran.

In his 2024 presidential campaign, Trump promised to lower prices, and inflation had stabilised at 2.4 percent ahead of the war, according to government data released on Wednesday. Analysts speculate the conflict will likely push it back up.

The US spent more than $11.3bn in the first six days of the war, Pentagon officials told lawmakers in a classified briefing on Tuesday, Reuters reported this week – nearly $2bn a day.

The Washington-based think tank, Center for Strategic and International Studies (CSIS), estimated that the war cost Washington $3.7bn in its first 100 hours alone, or nearly $900m a day, largely due to its expenditure on costly munitions.

“It’s quite ironic that [Trump] chose a war that would make affordability worse, not better,” Rebecca Christie, a senior fellow at the Bruegel think tank, told Al Jazeera’s Counting the Cost.

“Every time the US loses even one object, air defence or a plane or something like that, that represents an awful lot of money that could have been used on some of these issues that have an impact on people’s day-to-day lives in the United States.”