The reactor building at the Russian-built Bushehr nuclear power plant in southern Iran, 1200 Kms south of Tehran, where Iran has began unloading fuel into the reactor core for the nuclear power plant on October 26, 2010, a move which brings the facility closer to generating electricity after decades of delay. AFP PHOTO/MEHR NEWS/MAJID ASGARIPOUR        (Photo credit should read MAJID ASGARIPOUR/AFP/Getty Images)
Majid Asgaripour/AFP/Getty Images
The reactor building at the Russian-built Bushehr nuclear power plant in southern Iran, 1200 Kms south of Tehran, where Iran has began unloading fuel into the reactor core for the nuclear power plant on October 26, 2010, a move which brings the facility closer to generating electricity after decades of delay. AFP PHOTO/MEHR NEWS/MAJID ASGARIPOUR (Photo credit should read MAJID ASGARIPOUR/AFP/Getty Images)
Now playing
02:17
Iran breaches nuclear deal for second time
TABRIZ, IRAN - JUNE 16: Iran presidential candidate Ebrahim Raeesi takes part in a campaign meeting with Residents of Tabriz on June 16, 2021 in Tabriz, Iran. The country's incumbent president, Hassan Rouhani, is ineligible to run again after serving two terms in office. (Photo by Meghdad Madadi ATPImages/Getty Images)
ATPImages/Getty Images Europe/Getty Images
TABRIZ, IRAN - JUNE 16: Iran presidential candidate Ebrahim Raeesi takes part in a campaign meeting with Residents of Tabriz on June 16, 2021 in Tabriz, Iran. The country's incumbent president, Hassan Rouhani, is ineligible to run again after serving two terms in office. (Photo by Meghdad Madadi ATPImages/Getty Images)
Now playing
04:11
Ultra-conservative candidate set to win Iran's presidential election
nigeria kidnapping explainer africa Asher pkg oneworld intl ldn vpx_00021802.png
nigeria kidnapping explainer africa Asher pkg oneworld intl ldn vpx_00021802.png
Now playing
02:20
'The stuff of nightmares': Breaking down Nigeria's kidnapping epidemic
screengrab china shenzhou 12 launch
CCTV
screengrab china shenzhou 12 launch
Now playing
01:59
See Chinese rocket launch to send astronauts to its space station
Putin praises biden Geneva summit Robertson lkl intl hnk vpx_00010025.png
Putin praises biden Geneva summit Robertson lkl intl hnk vpx_00010025.png
Now playing
02:09
Hear Putin offer rare praise for President Biden
Iran presidential election Pleitgen pkg intl hnk vpx_00021422.png
Iran presidential election Pleitgen pkg intl hnk vpx_00021422.png
Now playing
02:22
Hear from Iranian voters as they head to polls in presidential election
Host TV
Now playing
07:15
'What are you so afraid of?': Journalist presses Putin on political opposition
Russian President Vladimir Putin faces questions from reporters after his meeting with US President Joe Biden in Geneva, Switzerland.
Host TV
Russian President Vladimir Putin faces questions from reporters after his meeting with US President Joe Biden in Geneva, Switzerland.
Now playing
04:44
Putin faces question about cyberattacks against the US
CNN's Christiane Amanpour provides analysis following a summit between President Joe Biden and Russian President Vladimir Putin.
CNN
CNN's Christiane Amanpour provides analysis following a summit between President Joe Biden and Russian President Vladimir Putin.
Now playing
01:59
Amanpour: Biden did something very different than Trump
President Joe Biden meets with Russian President Vladimir Putin, Wednesday, June 16, 2021, at the 'Villa la Grange', in Geneva, Switzerland.
Patrick Semansky/AP
President Joe Biden meets with Russian President Vladimir Putin, Wednesday, June 16, 2021, at the 'Villa la Grange', in Geneva, Switzerland.
Now playing
02:55
Ward describes 'uncomfortable' photo op between Biden and Putin
biden putin summit us russia press pools clash collins sot vpx_00012417.png
biden putin summit us russia press pools clash collins sot vpx_00012417.png
Now playing
01:40
Collins: 'Combative exchanges' between Russian and US press corps
Pool
Now playing
02:49
See Biden and Putin shake hands as summit begins in Geneva
GAZA CITY, GAZA - JUNE 15: Flames are seen after an Israeli air strike hit Hamas targets in Gaza City, Gaza on June 15, 2021. (Photo by Ali Jadallah/Anadolu Agency via Getty Images)
Ali Jadallah/Anadolu Agency/Getty Images
GAZA CITY, GAZA - JUNE 15: Flames are seen after an Israeli air strike hit Hamas targets in Gaza City, Gaza on June 15, 2021. (Photo by Ali Jadallah/Anadolu Agency via Getty Images)
Now playing
03:58
Israel launches airstrikes in Gaza over incendiary balloons
China successfully launched the first module of its planned space station from the Wenchang launch site in the southern island of Hainan, according to the China National Space Administration.
CCTV
China successfully launched the first module of its planned space station from the Wenchang launch site in the southern island of Hainan, according to the China National Space Administration.
Now playing
01:04
See China's last rocket launch to send in space key component of its space station
BANGUI, CENTRAL AFRICAN REPUBLIC - MARCH 18: A view of daily life in part of street on March 18, 2021 in the capital Bangui, Central African Republic.  Most of the population in Bangui live well below the poverty line, in a country traumatised by years of unrest. (Photo by Siegfried Modola/Getty Images)
Siegfried Modola/Getty Images
BANGUI, CENTRAL AFRICAN REPUBLIC - MARCH 18: A view of daily life in part of street on March 18, 2021 in the capital Bangui, Central African Republic. Most of the population in Bangui live well below the poverty line, in a country traumatised by years of unrest. (Photo by Siegfried Modola/Getty Images)
Now playing
06:12
Russian mercenaries accused of atrocities in the Central African Republic
Taiwan has been the chief source of tension between Washington and Beijing for decades and is widely seen as the most likely trigger for a potentially catastrophic US-China war. The worry about Taiwan comes as China wields new strength from years of military buildup. CNN's David Culver reports.
PLA Air Force/Weibo
Taiwan has been the chief source of tension between Washington and Beijing for decades and is widely seen as the most likely trigger for a potentially catastrophic US-China war. The worry about Taiwan comes as China wields new strength from years of military buildup. CNN's David Culver reports.
Now playing
04:04
Dramatic videos show Chinese naval exercises amid rising tensions over Taiwan (April 2021)
CNN —  

Tehran has started to increase uranium enrichment beyond the purity threshold it agreed to as part of a landmark nuclear deal, the Iranian government announced Sunday.

The announcement means the country is no longer complying with the agreement it signed with the United States and five other nations in 2015.

The move comes after US President Donald Trump withdrew from the deal and re-introduced economic sanctions in 2018.

Iran announced a partial withdrawal from the deal in May. Sunday marked the end of a 60-day ultimatum the country gave to the European signatories of the deal to ease sanctions on its banking and oil sectors.

Formally known as the Joint Comprehensive Plan of Action (JCPOA), the nuclear accord was intended to limit Iran’s civilian nuclear program and prevent it from developing nuclear weapons.

Iranian government spokesperson Ali Rabiei said Iran would cross the agreed 3.67% threshold on Sunday. He added that future concentration will be based on Iran’s needs.

Keeping uranium enrichment to below 3.67% was one of the commitments Iran made in return for the lifting of economic sanctions in 2015. The level is enough for civil use to power parts of the country, but not enough to build a nuclear bomb.

Iran made two other major commitments as part of the deal. It agreed to reduce the number of its centrifuges, the tube-shaped machines that are used to enrich uranium, by two-thirds, and to slash its stockpile of enriched uranium by 98%.

Iran’s Foreign Minister Javad Zarif sent a letter to the European Union’s foreign representative Federica Mogherini to inform her Iran would no longer adhere to the deal’s commitments, according to the country’s Deputy Foreign Minister Seyed Abbas Araghchi.

“We will give an additional 60 days of time starting today before taking further steps,” he wrote in Sunday’s letter.

An EU spokesperson said the bloc was “extremely concerned at Iran’s announcement.”

“We strongly urge Iran to stop and reverse all activities inconsistent with its commitments under the JCPOA … we are in contact with the other JCPOA participants regarding the next steps,” the spokesperson said.

Israel has already called on European leaders to impose sanctions on Iran. “The enrichment of uranium is made for one reason and one reason only – it’s for the creation of atomic bombs,” Prime Minister Benjamin Netanyahu said at a Cabinet meeting Sunday morning.

The International Atomic Energy Agency said Sunday its inspectors would verify Iran’s announcement.

“We are aware of Iran’s announcement related to its uranium enrichment level. IAEA inspectors in Iran will report to our headquarters as soon as they verify the announced development,” Fredrik Dahl, the agency’s spokesperson, told CNN.

The 2015 deal was signed following two years of intense negotiations by the United States, China, France, Germany, Russia and the United Kingdom in 2015.

Trump’s decision to ditch the deal – one of the landmark achievements of his predecessor in the White House, Barack Obama – put pressure on the remaining signatories. They could either side with Trump and risk Iran developing a nuclear weapon, or try to save the deal and possibly exposing themselves to potential US sanctions.

A spokesperson for the UK Foreign Office said in a statement the country remained “fully committed to the deal,” but added that “Iran must immediately stop and reverse all activities inconsistent with its obligations.”

Germany also urged Iran to “stop and reverse” all activities that breach the deal. “We had called upon Iran not to take further measures that undermine the nuclear deal,” Germany’s foreign ministry said in a statement.

French President Emmanuel Macron condemned Iran on Sunday for breaching the limits, a spokesperson for the Élysée presidential palace told CNN on Sunday.

Macron made a last-ditch attempt to salvage the agreement on Saturday. He discussed the deal with the Iranian President Hassan Rouhani during a phone call Saturday, according to Iran’s official news agency IRNA and the Élysée presidential palace in Paris.

The French statement said Macron agreed with Rouhani to explore options “for a resumption of dialogue between all parties” by July 15.

During the phone call, Macron voiced “his strong concern about the risk of a further weakening of the 2015 nuclear agreement, and the consequences that would necessarily follow.”

This story has been updated to correct the position of Seyed Abbas Araghchi.

CNN’s Sam Bradpiece, Oren Liebermann, Michael Schwartz, Jennifer Hauser, Sarah El Sirgany, Sara Mazloumsaki, Milena.Veselinovic, Duarte Mendoca and Jennifer Deaton contributed to this article.