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Long, Fraught Timeline of Iran Nuclear Tensions

Members of the UN Security Council vote in favor of a resolution that would permanently lift UN sanctions on Iran at the UN headquarters in New York City, US, September 19, 2025. REUTERS/Eduardo Munoz
Members of the UN Security Council vote in favor of a resolution that would permanently lift UN sanctions on Iran at the UN headquarters in New York City, US, September 19, 2025. REUTERS/Eduardo Munoz
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Long, Fraught Timeline of Iran Nuclear Tensions

Members of the UN Security Council vote in favor of a resolution that would permanently lift UN sanctions on Iran at the UN headquarters in New York City, US, September 19, 2025. REUTERS/Eduardo Munoz
Members of the UN Security Council vote in favor of a resolution that would permanently lift UN sanctions on Iran at the UN headquarters in New York City, US, September 19, 2025. REUTERS/Eduardo Munoz

The United Nations reimposed nuclear sanctions on Iran Sunday, putting new pressure on Tehran's ailing economy as tensions remain high in the wider Mideast over the Israel-Hamas war in the Gaza Strip.

Iranian President Masoud Pezeshkian and Foreign Minister Abbas Araghchi offered a last-ditch effort to try to halt the sanctions at the UN General Assembly met this week in New York. Efforts by China and Russia to stop the sanctions failed as well.

The clock started when France, Germany and the United Kingdom on Aug. 28 declared Iran wasn’t complying with its 2015 nuclear deal with world powers

Here's a timeline of the tensions over Iran's atomic program:

Early days 1967 — Iran takes possession of its Tehran Research Reactor under America’s “Atoms for Peace” program.

1979 — US ally Shah Mohammad Reza Pahlavi, fatally ill, flees Iran as popular protests against him surge. Khomeini returns to Tehran and the Iranian Revolution sweeps him to power. Students seize the United States Embassy in Tehran, beginning the 444-day hostage crisis. Iran’s nuclear program goes fallow under international pressure.

August 2002 — Western intelligence services and an Iranian opposition group reveal Iran’s secret Natanz nuclear enrichment facility.

June 2003 — Britain, France and Germany engage Iran in nuclear negotiations.

October 2003 — Iran suspends uranium enrichment under international pressure.

February 2006 — Iran announces it will restart uranium enrichment following the election of hard-line president Mahmoud Ahmadinejad. Britain, France and Germany walk out of stalled negotiations.

June 2009 — Iran’s disputed presidential election sees Ahmadinejad reelected despite fraud allegations, sparking protests known as the Green Movement and a violent government crackdown.

October 2009 — Under US President Barack Obama, the US and Iran open a secret back-channel for messages in the sultanate of Oman.

July 2012 — US and Iranian officials hold secret face-to-face talks in Oman.

July 2015 — World powers and Iran announce a long-term, comprehensive nuclear agreement that limits Tehran's enrichment of uranium in exchange for the lifting of economic sanctions.

The nuclear deal collapses May 8, 2018 — Trump unilaterally withdraws the US from the nuclear agreement, calling it the “worst deal ever.” He says he’ll get better terms in new negotiations to stop Iran’s missile development and support for regional militias. Those talks don’t happen in his first term.

May 8, 2019 — Iran announces it will begin backing away from the accord. A series of regional attacks on land and at sea blamed on Tehran follow.

Jan. 3, 2020 — A US drone strike in Baghdad kills Gen. Qassem Soleimani, the architect of Tehran’s proxy wars in the Middle East.

Jan. 8, 2020 — In retaliation for Soleimani’s killing, Iran launches a barrage of missiles at military bases in Iraq that are home to thousands of American and Iraqi troops. More than 100 US service members suffer traumatic brain injuries, according to the Pentagon. As Iran braces for a counterattack, the Revolutionary Guard shoots down a Ukrainian passenger plane shortly after takeoff from Tehran’s international airport, reportedly mistaking it for a US cruise missile. All 176 people on board are killed.

July 2, 2020 — A mysterious explosion tears apart a centrifuge production plant at Iran’s Natanz nuclear enrichment facility. Iran blames the attack on archenemy Israel.

April 6, 2021 — Iran and the US under President Joe Biden begin indirect negotiations in Vienna over how to restore the nuclear deal. Those talks, and others between Tehran and European nations, fail to reach any agreement.

April 11, 2021 — A second attack within a year targets Iran’s Natanz nuclear site, again likely carried out by Israel.

April 16, 2021 — Iran begins enriching uranium up to 60% — its highest purity ever and a technical step from weapons-grade levels of 90%.

Feb. 24, 2022 — Russia launches its full-scale invasion of Ukraine. Moscow ultimately will come to rely on Iranian bomb-carrying drones in the conflict, as well as missiles.

July 17, 2022 — An adviser to Iran’s supreme leader, Kamal Kharrazi, says Iran is technically capable of making a nuclear bomb, but has not decided whether to build one.

Mideast wars rage Oct. 7, 2023 — Hamas militants from the Gaza Strip storm into Israel, killing around 1,200 people and taking 251 others hostage, beginning the most intense war ever between Israel and Hamas. Iran, which has armed Hamas, offers support to the militants. Regional tensions spike.

Nov. 19, 2023 — Yemen’s Houthis, long supported by Iran, seize the ship Galaxy Leader, beginning a monthslong campaign of attacks on shipping through the Red Sea corridor that the US Navy describes as the most intense combat it has seen since World War II. The attacks mirror tactics earlier used by Iran.

April 14, 2024 — Iran launches an unprecedented direct attack on Israel, firing over 300 missiles and attack drones. Israel, working with a US-led international coalition, intercepts much of the incoming fire.

April 19, 2024 — A suspected Israeli strike hits an air defense system by an airport in Isfahan, Iran.

July 31, 2024 — Ismail Haniyeh, a Hamas leader, is assassinated during a visit to Tehran after the inauguration of reformist President Masoud Pezeshkian. Israel later takes responsibility for the assassination.

Sept. 27, 2024 — An Israeli airstrike kills Hezbollah leader Hassan Nasrallah in Lebanon.

Oct. 1, 2024 — Iran launches its second direct attack on Israel, though a US-led coalition and Israel shoot down most of the missiles.

Oct. 16, 2024 — Israel kills Hamas leader Yahya Sinwar in the Gaza Strip.

Oct. 26, 2024 — Israel openly attacks Iran for the first time, striking air defense systems and sites associated with its missile program.

Trump returns — and reaches out Jan. 20, 2025 — Trump is inaugurated for his second term as president.

Feb. 7, 2025 — Iran's Supreme Leader Ali Khamenei says proposed talks with the US are “not intelligent, wise or honorable.”

March 7, 2025 — Trump says he sent a letter to Khamenei seeking a new nuclear deal with Tehran.

March 15, 2025 — Trump launches intense airstrikes targeting Houthis in Yemen, the last members of Iran's self-described “Axis of Resistance” capable of daily attacks.

April 7, 2025 — Trump announces the US and Iran will hold direct talks in Oman. Iran says they'll be indirect talks, but confirms the meeting.

April 12, 2025 — The first round of talks between Iran and the US take place in Oman, ending with a promise to hold more talks after US Mideast envoy Steve Witkoff and Iranian Foreign Minister Abbas Araghchi “briefly spoke” together.

April 19, 2025 — The second round of talks between the US and Iran are held in Rome.

April 26, 2025 — Iran and the US meet in Oman a third time, but the negotiations include talks at the expert level for the first time.

May 11, 2025 — Iran and the US meet in Oman for a fourth round of negotiations ahead of Trump's trip to the Mideast.

May 23, 2025 — Iran and the US meet in Rome for a fifth round of talks, with Oman saying the negotiations made "some but not conclusive progress."

The Iran-Israel war begins June 9, 2025 — Iran signals it won't accept a US proposal over the nuclear program.

June 12, 2025 — The Board of Governors at the International Atomic Energy Agency finds Iran in noncompliance with its nuclear obligations. Iran responds by announcing it has built and will activate a third nuclear enrichment facility.

June 13, 2025 — Israel launches its war against Iran. Over 12 days, it hits nuclear and military sites, as well as other government installations.

June 22, 2025 — The US intervenes in the war, attacking three Iranian nuclear sites.

June 23, 2025 — Iran responds to the US attack by targeting a military base in Qatar used by American troops, causing limited damage.

June 24, 2025 — Trump announces a ceasefire in the war.

July 25, 2025 — Iranian and European diplomats hold talks in Istanbul over Iran's nuclear program.

Aug. 8, 2025 — France, Germany and the United Kingdom warn Iran in a letter that it will reimplement UN sanctions if there is no “satisfactory solution” to the nuclear standoff by Aug. 31.

Aug. 28, 2025 — France, Germany and the United Kingdom say they've started the process to “snapback” UN sanctions on Iran.

Sept. 9, 2025 — Iran and the International Atomic Energy Agency reach a deal over potentially starting inspections, but questions remain over its implementation.

Sept. 19, 2025 — UN Security Council declines to stop “snapback” sanctions on Iran.

Sept. 26, 2025 — UN Security Council rejects China and Russia's last-minute effort to stop “snapback.”

Sept. 28, 2025 — UN reimposes “snapback” sanctions on Iran barring any last-minute diplomacy.

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Is Iran Pushing Houthis Toward Military Action Against Washington?

Houthis continue mobilization, fundraising, and declare combat readiness (AP) 
Houthis continue mobilization, fundraising, and declare combat readiness (AP) 
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Is Iran Pushing Houthis Toward Military Action Against Washington?

Houthis continue mobilization, fundraising, and declare combat readiness (AP) 
Houthis continue mobilization, fundraising, and declare combat readiness (AP) 

As US military movements intensify in the Middle East and the possibility of strikes on Iran looms, Yemen’s Houthi group has continued military preparations, mobilizing fighters and establishing new weapons sites.

The Houthi mobilization comes at a time when the group is widely viewed as one of Iran’s most important regional arms for retaliation.

Although the Iran-backed group has not issued any official statement declaring its position on a potential US attack on Iran, its leaders have warned Washington against any military action and against bearing full responsibility for any escalation and its consequences.

They have hinted that any response would be handled in accordance with the group’s senior leadership's assessment, after evaluating developments and potential repercussions.

Despite these signals, some interpret the Houthis’ stance as an attempt to avoid drawing the attention of the current US administration, led by President Donald Trump, to the need for preemptive action in anticipation of a potential Houthi response.

The Trump administration previously launched a military campaign against the group in the spring of last year, inflicting heavy losses.

Islam al-Mansi, an Egyptian researcher specializing in Iranian affairs, said Iran may avoid burning all its cards unless absolutely necessary, particularly given US threats to raise the level of escalation should any Iranian military proxies intervene or take part in a confrontation.

Iran did not resort to using its military proxies during its confrontation with Israel or during a limited US strike last summer because it did not perceive an existential threat, al-Mansi said.

That calculation could change in the anticipated confrontation, potentially prompting Houthi intervention, including targeting US allies, interests, and military forces, he told Asharq Al-Awsat.

Al-Mansi added that although Iran previously offered, within a negotiating framework, to abandon its regional proxies, including the Houthis, this makes it more likely that Tehran would use them in retaliation, noting that Iran created these groups to defend its territory from afar.

Many intelligence reports suggest that Iran’s Revolutionary Guard has discussed with the Houthis the activation of alternative support arenas in a potential US-Iran confrontation, including the use of cells and weapons not previously deployed.

Visible readiness

In recent days, Chinese media outlets cited an unnamed Houthi military commander as saying the group had raised its alert level and carried out inspections of missile launch platforms in several areas across Yemen, including the strategically important Red Sea region.

In this context, Yemeni political researcher Salah Ali Salah said the Houthis would participate in defending Iran against any US attacks, citing the group’s media rhetoric accompanying mass rallies, which openly supports Iran’s right to defend itself.

While this rhetoric maintains some ambiguity regarding Iran, it repeatedly invokes the war in Gaza and renews Houthi pledges to resume military escalation in defense of the besieged enclave’s population, Salah told Asharq Al-Awsat.

He noted that Iran would not have shared advanced and sophisticated military technologies with the Houthis without a high degree of trust in their ability to use them in Iran’s interest.

In recent months, following Israeli strikes on the unrecognized Houthi government and several of its leaders, hardline Houthi figures demonstrating strong loyalty to Iran have become more prominent.

On the ground, the group has established new military sites and moved equipment and weapons to new locations along and near the coast, alongside the potential use of security cells beyond Yemen’s borders.

Salah said that if the threat of a military strike on Iran escalates, the Iranian response could take a more advanced form, potentially including efforts to close strategic waterways, placing the Bab al-Mandab Strait within the Houthis’ target range.

Many observers have expressed concern that the Houthis may have transferred fighters and intelligence cells outside Yemen over recent years to target US and Western interests in the region.

Open options

After a ceasefire was declared in Gaza, the Houthis lost one of their key justifications for mobilizing fighters and collecting funds. The group has since faced growing public anger over its practices and worsening humanitarian conditions, responding with media messaging aimed at convincing audiences that the battle is not over and that further rounds lie ahead.

Alongside weekly rallies in areas under their control in support of Gaza, the Houthis have carried out attacks on front lines with Yemen’s internationally recognized government, particularly in Taiz province.

Some military experts describe these incidents as probing attacks, while others see them as attempts to divert attention from other activities.

In this context, Walid al-Abara, head of the Yemen and Gulf Studies Center, said the Houthis entered a critical phase after the Gaza war ended, having lost one of the main justifications for their attacks on Red Sea shipping.

As a result, they may seek to manufacture new pretexts, including claims of sanctions imposed against them, to maintain media momentum and their regional role.

Al-Abara told Asharq Al-Awsat that the group has two other options. The first is redirecting its activity inward to strengthen its military and economic leverage, either to impose its conditions in any future settlement or to consolidate power.

The second is yielding to international and regional pressure and entering a negotiation track, particularly if sanctions intensify or its economic and military capacity declines.

According to an assessment by the Yemen and Gulf Studies Center, widespread protests in Iran are increasingly pressuring the regime’s ability to manage its regional influence at the same pace as before, without dismantling its network of proxies.

This reality is pushing Tehran toward a more cautious approach, governed by domestic priorities and cost-benefit calculations, while maintaining a minimum level of external influence without broad escalation.

Within this framework, al-Abara said Iran is likely to maintain a controlled continuity in its relationship with the Houthis through selective support that ensures the group remains effective.

However, an expansion of protests or a direct military strike on Iran could open the door to a deeper Houthi repositioning, including broader political and security concessions in exchange for regional guarantees.

Features

The Gaza Ceasefire Began Months Ago. Here’s Why the Fighting Persists

Israeli soldiers and tanks stand in Gaza, as seen from the Israeli side of the Israel-Gaza border, in Israel, February 4, 2026. REUTERS/Amir Cohen
Israeli soldiers and tanks stand in Gaza, as seen from the Israeli side of the Israel-Gaza border, in Israel, February 4, 2026. REUTERS/Amir Cohen
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The Gaza Ceasefire Began Months Ago. Here’s Why the Fighting Persists

Israeli soldiers and tanks stand in Gaza, as seen from the Israeli side of the Israel-Gaza border, in Israel, February 4, 2026. REUTERS/Amir Cohen
Israeli soldiers and tanks stand in Gaza, as seen from the Israeli side of the Israel-Gaza border, in Israel, February 4, 2026. REUTERS/Amir Cohen

As the bodies of two dozen Palestinians killed in Israeli strikes arrived at hospitals in Gaza on Wednesday, the director of one asked a question that has echoed across the war-ravaged territory for months.

“Where is the ceasefire? Where are the mediators?” Shifa Hospital's Mohamed Abu Selmiya wrote on Facebook.

At least 556 Palestinians have been killed in Israeli strikes since a US-brokered truce came into effect in October, including 24 on Wednesday and 30 on Saturday, according to Gaza's Health Ministry. Four Israeli soldiers have been killed in Gaza in the same period, with more injured, including a soldier whom the military said was severely wounded when militants opened fire near the ceasefire line in northern Gaza overnight.

Other aspects of the agreement have stalled, including the deployment of an international security force, Hamas' disarmament and the start of Gaza's reconstruction. The opening of the Rafah border crossing between Gaza and Egypt raised hope of further progress, but fewer than 50 people were allowed to cross on Monday, The Associated Press said.

Hostages freed as other issues languish In October, after months of stalled negotiations, Israel and Hamas accepted a 20-point plan proposed by US President Donald Trump aimed at ending the war unleashed by Hamas' Oct. 7, 2023, attack into Israel.

At the time, Trump said it would lead to a “Strong, Durable, and Everlasting Peace."

Hamas freed all the living hostages it still held at the outset of the deal in exchange for thousands of Palestinian prisoners held by Israel and the remains of others.

But the larger issues the agreement sought to address, including the future governance of the strip, were met with reservations, and the US offered no firm timeline.

The return of the remains of hostages meanwhile stretched far beyond the 72-hour timeline outlined in the agreement. Israel recovered the body of the last hostage only last week, after accusing Hamas and other militant groups of violating the ceasefire by failing to return all of the bodies. The militants said they were unable to immediately locate all the remains because of the massive destruction caused by the war — a claim Israel rejected.

The ceasefire also called for an immediate influx of humanitarian aid, including equipment to clear rubble and rehabilitate infrastructure. The United Nations and humanitarian groups say aid deliveries to Gaza's 2 million Palestinians have fallen short due to customs clearance problems and other delays. COGAT, the Israeli military body overseeing aid to Gaza, has called the UN's claims “simply a lie.”

Ceasefire holds despite accusations

Violence has sharply declined since the ceasefire paused a war in which more than 71,800 Palestinians have been killed, according to the Gaza Health Ministry. The ministry is part of the Hamas-led government and maintains detailed records seen as generally reliable by UN agencies and independent experts.

Hamas-led militants killed some 1,200 people in the initial October 2023 attack and took around 250 hostage.

Both sides say the agreement is still in effect and use the word “ceasefire” in their communications. But Israel accuses Hamas fighters of operating beyond the truce line splitting Gaza in half, threatening its troops and occasionally opening fire, while Hamas accuses Israeli forces of gunfire and strikes on residential areas far from the line.

Palestinians have called on US and Arab mediators to get Israel to stop carrying out deadly strikes, which often kill civilians. Among those killed on Wednesday were five children, including two babies. Hamas, which accuses Israel of hundreds of violations, called it a “grave circumvention of the ceasefire agreement.”

In a joint statement on Sunday, eight Arab and Muslim countries condemned Israel’s actions since the agreement took effect and urged restraint from all sides “to preserve and sustain the ceasefire.”

Israel says it is responding to daily violations committed by Hamas and acting to protect its troops. “While Hamas’ actions undermine the ceasefire, Israel remains fully committed to upholding it,” the military said in a statement on Wednesday.

“One of the scenarios the (military) has to be ready for is Hamas is using a deception tactic like they did before October 7 and rearming and preparing for an attack when it’s comfortable for them,” said Lt. Col. Nadav Shoshani, a military spokesperson.

Some signs of progress

The return of the remains of the last hostage, the limited opening of the Rafah crossing, and the naming of a Palestinian committee to govern Gaza and oversee its reconstruction showed a willingness to advance the agreement despite the violence.

Last month, US envoy Steve Witkoff, who played a key role in brokering the truce, said it was time for “transitioning from ceasefire to demilitarization, technocratic governance, and reconstruction.”

That will require Israel and Hamas to grapple with major issues on which they have been sharply divided, including whether Israel will fully withdraw from Gaza and Hamas will lay down its arms.

Though political leaders are holding onto the term “ceasefire” and have yet to withdraw from the process, there is growing despair in Gaza.

On Saturday, Atallah Abu Hadaiyed heard explosions in Gaza City during his morning prayers and ran outside to find his cousins lying on the ground as flames curled around them.

“We don’t know if we’re at war or at peace,” he said from a displacement camp, as tarpaulin strips blew off the tent behind him.

Features

What to Know as Iran and US Set for Nuclear Talks in Oman

The flags of USA and Iran are displayed in Muscat, Oman, 25 April 2025. EPA/ALI HAIDER
The flags of USA and Iran are displayed in Muscat, Oman, 25 April 2025. EPA/ALI HAIDER
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What to Know as Iran and US Set for Nuclear Talks in Oman

The flags of USA and Iran are displayed in Muscat, Oman, 25 April 2025. EPA/ALI HAIDER
The flags of USA and Iran are displayed in Muscat, Oman, 25 April 2025. EPA/ALI HAIDER

Iran and the United States will hold talks Friday in Oman, their latest over Tehran's nuclear program after Israel launched a 12-day war on the country in June and Iran launched a bloody crackdown on nationwide protests.

US President Donald Trump has kept up pressure on Iran, suggesting America could attack Iran over the killing of peaceful demonstrators or if Tehran launches mass executions over the protests. Meanwhile, Trump has pushed Iran's nuclear program back into the frame as well after the June war disrupted five rounds of talks held in Rome and Muscat, Oman, last year.

Trump began the diplomacy initially by writing a letter last year to Iran’s 86-year-old Supreme Leader Ali Khamenei to jump start these talks. Khamenei has warned Iran would respond to any attack with an attack of its own, particularly as the theocracy he commands reels following the protests.

Here’s what to know about Iran’s nuclear program and the tensions that have stalked relations between Tehran and Washington since the 1979 Iranian Revolution.

Trump writes letter to Khamenei Trump dispatched the letter to Khamenei on March 5, 2025, then gave a television interview the next day in which he acknowledged sending it. He said: “I’ve written them a letter saying, ‘I hope you’re going to negotiate because if we have to go in militarily, it’s going to be a terrible thing.’”

Since returning to the White House, the president has been pushing for talks while ratcheting up sanctions and suggesting a military strike by Israel or the US could target Iranian nuclear sites.

A previous letter from Trump during his first term drew an angry retort from the supreme leader.

But Trump’s letters to North Korean leader Kim Jong Un in his first term led to face-to-face meetings, though no deals to limit Pyongyang’s atomic bombs and a missile program capable of reaching the continental US.

Oman mediated previous talks

Oman, a sultanate on the eastern edge of the Arabian Peninsula, has mediated talks between Iranian Foreign Minister Abbas Araghchi and US Mideast envoy Steve Witkoff. The two men have met face to face after indirect talks, a rare occurrence due to the decades of tensions between the countries.

It hasn't been all smooth, however. Witkoff at one point made a television appearance in which he suggested 3.67% enrichment for Iran could be something the countries could agree on. But that’s exactly the terms set by the 2015 nuclear deal struck under former President Barack Obama, from which Trump unilaterally withdrew America. Witkoff, Trump and other American officials in the time since have maintained Iran can have no enrichment under any deal, something to which Tehran insists it won't agree.

Those negotiations ended, however, with Israel launching the war in June on Iran.

The 12-day war and nationwide protests Israel launched what became a 12-day war on Iran in June that included the US bombing Iranian nuclear sites. Iran later acknowledged in November that the attacks saw it halt all uranium enrichment in the country, though inspectors from the International Atomic Energy Agency have been unable to visit the bombed sites.

Iran soon experienced protests that began in late December over the collapse of the country's rial currency. Those demonstrations soon became nationwide, sparking Tehran to launch a bloody crackdown that killed thousands and saw tens of thousands detained by authorities.

Iran’s nuclear program worries the West Iran has insisted for decades that its nuclear program is peaceful. However, its officials increasingly threaten to pursue a nuclear weapon. Iran now enriches uranium to near weapons-grade levels of 60%, the only country in the world without a nuclear weapons program to do so.

Under the original 2015 nuclear deal, Iran was allowed to enrich uranium up to 3.67% purity and to maintain a uranium stockpile of 300 kilograms (661 pounds). The last report by the International Atomic Energy Agency on Iran’s program put its stockpile at some 9,870 kilograms (21,760 pounds), with a fraction of it enriched to 60%.

US intelligence agencies assess that Iran has yet to begin a weapons program, but has “undertaken activities that better position it to produce a nuclear device, if it chooses to do so.” Iranian officials have threatened to pursue the bomb.

Decades of tense relations between Iran and the US Iran was once one of the US’s top allies in the Mideast under Shah Mohammad Reza Pahlavi, who purchased American military weapons and allowed CIA technicians to run secret listening posts monitoring the neighboring Soviet Union. The CIA had fomented a 1953 coup that cemented the shah’s rule.

But in January 1979, the shah, fatally ill with cancer, fled Iran as mass demonstrations swelled against his rule. The Iranian Revolution followed, led by Grand Khomeini, and created Iran’s theocratic government.

Later that year, university students overran the US Embassy in Tehran, seeking the shah’s extradition and sparking the 444-day hostage crisis that saw diplomatic relations between Iran and the US severed.

The Iran-Iraq war of the 1980s saw the US back Saddam Hussein. The “Tanker War” during that conflict saw the US launch a one-day assault that crippled Iran at sea, while the US later shot down an Iranian commercial airliner that the US military said it mistook for a warplane.

Iran and the US have seesawed between enmity and grudging diplomacy in the years since, with relations peaking when Tehran made the 2015 nuclear deal with world powers. But Trump unilaterally withdrew America from the accord in 2018, sparking tensions in the Mideast that persist today.