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United States President Donald Trump has claimed that a new nuclear deal being negotiated with Iran will be “far better” than the 2015 Joint Comprehensive Plan of Action (JCPOA), which the US withdrew from in 2018 during his first term.

On Tuesday, Trump extended the two-week ceasefire with Iran a day before it was set to expire, with hopes for a second round of talks in Islamabad, Pakistan.

Key among the US demands is that Iran stop all enrichment of uranium.

Iran has always insisted its nuclear programme is for civilian use only, such as for power generation, which requires uranium enrichment of between 3 percent and 5 percent. To build nuclear weapons, uranium needs to be enriched to 90 percent.

In this explainer, we visualise what uranium is, how it is enriched and how long it could take Iran to make a nuclear weapon.

What is uranium, and which countries have it?

Uranium is a dense metal used as a fuel in nuclear reactors and weapons. It is naturally radioactive and usually found in low concentrations in rocks, soil and even seawater. About 90 percent of the world’s uranium is produced in just five countries: Kazakhstan, Canada, Namibia, Australia and Uzbekistan. Reserves of uranium have also been found in other countries.

Uranium is extracted either by digging it out of the ground or, more commonly, through a chemical process that dissolves uranium from within the rock.

Before it can be used as nuclear fuel, uranium is processed through several different forms, including:

• Yellowcake: Mined ore is crushed and treated with chemicals to form a coarse powder known as yellowcake, which, irrespective of its name, is usually dark green or charcoal in colour, depending on how hot it has been treated.
• Uranium tetrafluoride: Yellowcake is then treated with hydrogen fluoride gas, which turns it into emerald-green crystals known as uranium tetrafluoride or green salt.
• Uranium hexafluoride: Green salt is further fluorinated to create a solid white crystal known as uranium hexafluoride. When heated slightly, this crystal turns into a gas, making it ready for enrichment.
• Uranium dioxide: The gas is spun in a centrifuge machine, which chemically converts it into a fine, black powder.
• Fuel pellets: The black powder is pressed to form black ceramic pellets, which can then be used in a nuclear reactor.

How is uranium enriched?

Natural uranium exists in three forms, called isotopes. They are the same element, with the same number of protons but different numbers of neutrons.

Most naturally occurring uranium (99.3 percent) is U-238 – the heaviest and least radioactive – while about 0.7 percent is U-235 and trace amounts (0.005 percent) are U-234.

To generate energy, scientists separate the lighter, more radioactive U-235 from the slightly heavier U-238 in a process called uranium enrichment. U-235 can sustain a nuclear chain reaction while U-238 cannot.

To enrich uranium, it must first be converted into a gas, known as uranium hexafluoride (UF₆). This gas is fed into a series of fast-spinning cylinders called centrifuges. These cylinders spin at extremely high speeds (often more than 1,000 revolutions per second). The spinning force pushes the heavier U-238 to the outer walls, while the lighter U-235 stays in the centre and is collected.

A single centrifuge provides only a tiny amount of separation. To reach higher concentrations – or “enrichment” – the process is repeated through a series of centrifuges, called a cascade, until the desired concentration of U-235 is achieved.

What are the different levels of uranium enrichment?

The higher the U‑235 percentage, the more highly enriched the uranium is.

Small amounts (3-5 percent) are enough to fuel nuclear power reactors, while weapons require much higher enrichment levels (about 90 percent).

The International Atomic Energy Agency (IAEA) considers anything below 20 percent to be low-enriched uranium (LEU), while anything above 20 percent is considered highly-enriched uranium (HEU).

Low enriched – less than 20 percent

• Commercial grade – 3-5 percent: This is the standard fuel for the vast majority of the world’s nuclear power plants
• Small modular reactors – 5-19.9 percent: Used in more modern reactors and advanced research reactors

Highly enriched – More than 20 percent

• Research grade – 20-85 percent: Used in specialised research reactors to produce medical isotopes or to test materials
• Weapons grade – above 90 percent: This is the level required for most nuclear weapons
• Naval grade – 93-97 percent: Used in the nuclear reactors that power submarines and aircraft carriers

Depleted uranium, which contains less than 0.3 percent U‑235, is the leftover product after enrichment. It can be used for radiation shielding or as projectiles in armour‑piercing weapons.

How long does it take to enrich uranium?

The effort it takes to enrich uranium is not linear, meaning it is much more difficult to go from 0.7 percent natural uranium to 20 percent LEU than it is to go from 20 percent to 90 percent HEU. Once uranium reaches 60 percent enrichment, it becomes much quicker to reach 90 percent weapons grade.

The effort it takes to enrich uranium is measured in separative work units (SWU).

According to the IAEA, Iran is believed to have about 440kg (970lbs) of uranium enriched to 60 percent – enough to theoretically build 10 or 11 low-technology atomic bombs if refined to 90 percent.

Ted Postol, professor emeritus of science, technology and international security at the Massachusetts Institute of Technology (MIT), told Al Jazeera that before the US attack on Iran’s nuclear facility at Fordow, the country had at least 10 cascades of 174 IR-6 centrifuges in operation – meaning 1,740 IR-6 centrifuges.

The IR-6 is one of Iran’s most advanced centrifuge models. The country also has tens of thousands of older centrifuges.

Little is known about the conditions of these centrifuges or the stocks of uranium hexafluoride, which are still believed to be buried underground.

Postol has calculated that Iran’s cascade of centrifuges could produce 900 to 1,000 SWUs annually.

“Getting from natural uranium to 60 percent enrichment, which Iran has already achieved, takes roughly five years, and about 5,000 SWUs using Iran’s cascades.”

“If I want to go from 60 to 90 percent, I only need 500 SWUs. So, instead of five years, [by] starting with the 60 percent here, this might take me four or five weeks. Because I am already very enriched,” Postol said.

Using an analogy of a clock, Postol explained: “Let’s say it takes seven minutes to get 33 percent enrichment, and then eight minutes to get to 50 percent enrichment. It only takes me one minute to get to total [90 percent] enrichment.”

How easy would it be for Iran to build a nuclear weapon?

Postol said Iran’s stockpile is held underground, meaning a military strike would not necessarily eliminate the nuclear threat.

A single centrifuge cascade capable of enriching weapons-grade uranium could take up “no more floor space than a studio apartment, making it easily hidden in a small laboratory”, he said, estimating the area at 60sq metres (600sq feet).

“A single Prius Compact Hybrid car can produce enough electric power to run four or more of these cascades at a time,” Postol added, meaning “Iran can covertly convert its 60 percent uranium into weapons-grade uranium metal”.

“What they have done is put themselves in a position where anybody who thinks about attacking them with nuclear weapons has to know that they could be sitting in those tunnels after such an attack, refining [and] enriching the final step they need to build atomic weapons and converting it to metal, and building a nuclear weapon, and that they have the means to deliver it,” Postol said.

“They would have all of the technical equipment they need to build the atomic weapons. And they have the missiles, which are also in the tunnels and can be manufactured in addition to what they already have. And the atomic weapon would not need to be tested, because uranium weapons do not need to be tested before they’re used.”

What does the NPT say about enrichment?

The Treaty on the Non-Proliferation of Nuclear Weapons (NPT), established in 1968, is a landmark international agreement aimed at preventing the spread of nuclear weapons and promoting peaceful uses of nuclear energy. Iran is a signatory to this pact.

The treaty supports the right of all signatories to access nuclear technology and enrich uranium for peaceful purposes, including energy, medical or industrial purposes, with precise safeguards to ensure it is not diverted to make weapons.

Under the NPT, nuclear-weapon states agree not to transfer nuclear weapons or assist non-nuclear-weapon states in developing them. Non-nuclear-weapon states also agree not to seek or acquire nuclear weapons.

Despite this, most nuclear powers are currently modernising their arsenals rather than dismantling them.

Most of the countries are signatories, except five: India, Pakistan, Israel, South Sudan and North Korea.

What agreements has Iran made about its nuclear programme in the past?

In 2015, under the Obama administration, Iran struck a deal with six world powers — China, France, Germany, Russia, the United Kingdom and the US — plus the European Union, known as the JCPOA.

Under the pact, Tehran agreed to scale down its nuclear programme, capping enrichment to 3.67 percent, in exchange for relief from sanctions.

“The Iranians agreed to it, and they were following the treaty. There was no problem with the treaty at all, absolutely no problem,” Postol said.

“They were allowed to have 6,000 centrifuges, which, if they had natural uranium, they could probably build a bomb within a year if they were secretly using these centrifuges, but that was all under inspection. They were just simply going to enrich to 3.67 percent, which is for a power reactor. They’re allowed to do that by the Non-Proliferation Treaty.”

But in 2018, Trump pulled out of the deal, calling it “one-sided” and reimposing sanctions on Iran. Iran responded by eventually resuming enrichment at Fordow.

After the US killed Iran’s General Qassem Soleimani in January 2020, Tehran stated it would no longer follow the set uranium enrichment limits.

Former President Joe Biden made attempts to revive the deal, but it never came to fruition due to disagreements over whether sanctions should be lifted first or Iran should rejoin the JCPOA first.

Trump has repeatedly said Iran should not have the ability to produce nuclear weapons. It has been one of Washington’s red lines during talks with Iranian officials over the past year, and was also the central justification that Washington used when it bombed Iranian nuclear facilities during the 12-day US-Israel war on Iran last year.

In the current negotiations, Iran has said it is willing to “downblend” its 60 percent enriched uranium to about 20 percent – the threshold for low-enriched uranium. The process of downblending involves mixing stocks with depleted uranium to achieve a lower percentage of enriched U-235 overall.

“From the point of view of showing goodwill, I think it’s good, it shows that the Iranians are thinking of ways to address what the Americans claim are their concerns,” Postol said.

Which countries have nuclear weapons?

Nine countries possessed roughly 12,187 nuclear warheads as of early 2026, according to the Federation of American Scientists. Approximately two-thirds are owned by two nations – Russia (4,400) and the US (3,700), excluding their retired nuclear arsenals.

Some 9,745 of the total existing nuclear weapons are military stockpiles for missiles, submarines and aircraft. The rest have been retired. Of the military stockpile, 3,912 are currently deployed on missiles or at bomber bases, according to the Federation of American Scientists. Of these, some 2,100 are on US, Russian, British and French warheads, ready for use at short notice.

While Russia and the US have dismantled thousands of warheads, several countries are thought to be increasing their stockpiles, notably China.

The only country to have voluntarily relinquished nuclear weapons is South Africa. In 1989, the government halted its nuclear weapons programme and began dismantling its six nuclear weapons the following year.

Israel is believed to possess nuclear weapons, with a stockpile of at least 90. It has consistently neither confirmed nor denied this, and despite numerous treaties, it faces little international pressure for transparency.

GERI Halliwell has jumped the final hurdle in a neighbour row – as her plans to build a £30k horse walker are finally approved.

The Spice Girls singer and her husband, ex-F1 boss Christian Horner, want to install the 77ft structure to train horses near their Oxfordshire home.

Geri, 53, and Christian, 52, own a horse racing company called OMBI, featuring stables for 14 horses and a full-time trainer.

But plans for the walker, essentially a circular cage that moves horses to improve their fitness, were met with fury by locals, with several objections registered with West Northamptonshire District Council.

Concerns over the height of the building, its visual impact, inadequate screening, and lighting have been raised by neighbours.

However, the council has now approved the application, provided the celebrity pair follow strict conditions.

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It said: “The building shall be used for private equestrian and land management uses only and no commercial use, including riding lessons, tuition, livery or competitions shall take place at any time.”

The authority added: “Whilst it is acknowledged that the walker incorporates a steep pitched roof for its size, the general design is functional in form.

“Giving regard to its siting, scale and rural-equestrian character, the design is considered appropriate for the open countryside location and would not harm the character of the area.”

Full details of lighting still need to be approved before it is built, but it is far enough away from neighbours not to cause issues, the council added.

And the couple have proposed to hide the training device with 12 newly-planted trees, which was deemed appropriate by planners.

But one neighbour, who objected to the horse walker plans, fumed the structure would be “extremely prominent” on the skyline.

He said: “Whilst we do not object to the principle of a horse walker… we object to the plans as currently presented.

“The proposed structure would be extremely visible from our property, other village properties, and from a public highway.

“In a rural conservation area this would be unacceptable as it would completely change the character of the area.”

The local also objected to the main property being “away from the main buildings when other infill sites are available”.

Another slammed the proposed lighting set-up and described the suggested screening as “totally inadequate.”

They said: “There is already significant lighting at the property. We would not want to see this area illuminated outside of normal working hours.

“Further lighting would be encroaching into an area which is currently unlit behind the existing barn.”

Writing on behalf of Geri and Christian, a planning agent pointed to the Department for Environment Food and Rural Affairs (DEFRA) codes.

He wrote: “It states that animals must be given freedom to exercise off the tether for a reasonable period at least once a day.

“The installation of the horse walker will ensure that this is possible and that they are exercised properly, regardless of weather conditions and other limiting factors.

“The proposed horse walker will provide the horses with a space to be suitably exercised off the tether.

“Once the new hedgerow matures it will be largely screened from all public and private views onto the farm.”

The scheme is the latest in a number of planning rows between the couple and their neighbours.

Geri and Christian were recently given approval to keep a pergola that had been built without planning permission.

Just last year, they were allowed to build a second pool on the grounds despite fears it would be a “blot on the landscape”.

And three years ago, they were also granted permission for a first floor extension, a replacement barn and a new greenhouse.

Geri’s representatives have been approached for comment.

March 24 (UPI) — NASA on Tuesday announced plans to spend $30 billion on a permanent lunar base and send astronauts to the moon every six months after the Artemis V mission.

Speaking at a so-called “Ignition” event at NASA headquarters in Washington, D.C., Administrator Jared Isaacman discussed plans to accelerate construction of a moon base.

“There will be an evolutionary path to building humanity’s first permanent surface outpost beyond Earth,” he said.

“NASA is committed to achieving the near-impossible once again: to return to the moon before the end of President [Donald] Trump’s term, build a moon base, establish an enduring presence, and do the other things needed to ensure American leadership in space.”

NASA’s plan was initially to focus on what it called the Gateway program — a space station that was going to orbit the moon. Then the agency would build a base on the moon.

Carlos Garcia-Galan, the program executive for NASA’s Moon Base program, said the systems and hardware already established for the Gateway program would be repurposed to build the moon base.

Isaacman said the moon base plan will comprise three phases.

The first phase would include a series of missions to send small robotic landers and vehicles astronauts can drive on the surface to the moon. It would also encompass communications and scientific instruments.

The second phase would involve the construction of a “semi-habitable infrastructure” for astronauts on the lunar surface.

The third phase would start construction of a more permanent structure.

The first two phases would involve an investment of $20 billion over the next seven years and dozens of missions to the moon. The third phase would cost another $10 billion.

“The moon base will not appear overnight,” Isaacman said.

Isaacman said NASA also plans to launch a nuclear-propelled spacecraft to Mars by 2028.

NASA’s launch window for Artemis II is set to open April. The crewed mission is expected to send the Space Launch System and Orion spacecraft to orbit the moon over 10 days and return to Earth. The crew will test whether the spacecraft operates in deep space.

The long-term goal of the Artemis program is to re-establish a human presence on the moon in preparation for the ultimate aim of putting a human on Mars.

Vancouver, Canada – Prime Minister Mark Carney’s efforts to unite Canadians around protecting the nation’s economy from the US are hitting roadblocks as he nears one year in power.

Indigenous peoples across Canada are increasingly divided over Carney’s aggressive push to expand resource extraction and projects on their ancestral lands.

Some experts question how his government can advance its agenda while respecting Indigenous rights enshrined in the country’s constitution.

March 14 will mark one year since Carney, former head of Canada’s central bank, was sworn into office.

After an election last year, his centrist Liberal party formed a minority government with the highest share of the popular vote in 40 years.

A key to Carney’s victory was his pledge to “stand strong” against US trade threats and grow Canada’s economic sovereignty, an assertive approach the prime minister has called “elbows up”.

“In the face of global trade shifts … we will build big and build fast to create a stronger, more sustainable, more independent economy,” Carney said in a statement on March 6.

Part of that push was to create a Major Projects Office to speed up approvals of economic developments, starting by fast-tracking 10 mega-projects.

They include two massive liquefied natural gas (LNG) plants and an open-pit mine in British Columbia, a nuclear plant in Ontario, a Quebec shipping terminal, and wind power in Atlantic Canada.

Those developments are worth 116 billion Canadian dollars ($85bn), the government estimates.

‘Our rights get pushed to the side’

Carney’s approach to the US trade war has gained support from Canadians, according to recent opinion surveys.

A March 3 poll of 1,500 citizens by Abacus Data found that 50 percent say Carney is protecting Canada’s core interests when dealing with Trump — compared with 36 percent with negative views.

“Whenever Canada is threatened, the protectionist nature of the state kind of re-emerges,” said Shady Hafez, assistant politics professor at Toronto Metropolitan University.

“Self-preservation of Canada becomes the priority.”

Hafez, a research associate with the Yellowhead Institute, is a member of the Kitigan Zibi Anishinabeg First Nation in Quebec.

He said there are growing concerns in his community and others about Carney’s push to accelerate mega-projects across the country.

“For that to happen, Canada needs land, and it needs resources,” Hafez said, “and it takes those lands and resources from us.”

Blowback was swift after Carney pledged to build a highly controversial oil pipeline to the west coast in a late November deal signed with Alberta, Canada’s oil powerhouse.

Carney’s culture minister swiftly resigned, decrying “no consultation” with Indigenous nations and “major environmental impacts”.

And the Assembly of First Nations (AFN), which represents more than 600 Indigenous chiefs, unanimously passed an emergency resolution opposing a new pipeline.

“First Nations people, we stand with Canada against Trump’s illegal tariffs, but not at the expense of our rights,” AFN National Chief Cindy Woodhouse Nepinak told Al Jazeera in an interview. “If you want to fast-track anything, you better make sure that First Nations are being included right off the bat.

“Trying to sideswipe or push aside First Nations people when there’s agreements between provinces and the feds — they have to remember that First Nations are here … and they are to be respected in their own homelands.”

The rights of Indigenous people in the country are enshrined in Canada’s constitution.

But too often, Hafez said, in the name of national prosperity, “Indigenous communities have to suffer.”

“Whenever there’s somewhat of an emergency, our rights get pushed to the side.”

But the resistance to the major projects push isn’t universal.

The First Nations Natural Gas Alliance praised Carney’s “much more aggressive” approach compared with his predecessor on developing energy resources.

But the group’s CEO, Karen Ogen, acknowledged there’s a “highly charged environment” on such issues.

“First Nations communities continue to face significant socioeconomic barriers”, stated the former chief of Wet’suwet’en First Nation. “LNG and natural gas development are not just an opportunity; they are a national imperative.

“Billions of dollars in procurement benefits and revenues are flowing to First Nations.”

Call for collaboration ‘on all major projects’

The trade war with the US has galvanised and united many Canadians — but with little acknowledgement of the impacts on Indigenous communities, said Sheryl Lightfoot, political science professor at the University of Toronto.

Lightfoot is vice-chair of the UN Expert Mechanism on the Rights of Indigenous Peoples.

“These projects, by many accounts, are advancing without full consultation or transparency”, she told Al Jazeera.

“It appears that economic or geopolitical pressures … are being used to justify bypassing Indigenous rights and environmental safeguards.”

But Canada’s Major Projects Office insists it will “seek input, hear concerns and ideas, and work in partnership moving forward” with Indigenous communities — and “will not be skipping over vital project steps including consultations with Indigenous Peoples,” an agency spokesperson wrote in an emailed statement.

“We are unlocking Canada’s economic potential, while respecting our environmental responsibilities and the rights of Indigenous Peoples,”

A significant number of projects on Carney’s fast-track list are concentrated in British Columbia (BC).

Those include two liquefied natural gas (LNG) terminals on the Pacific coast — LNG Canada and Ksi Lisims LNG — as well as the electric transmission line to power the sector, and a copper and gold mine.

BC is unique in the country because, historically, very little of its land was subject to treaties between the Crown and First Nations. Canada’s top court has repeatedly ruled in favour of First Nations rights and title in the westernmost province.

All four major projects in the province have proven divisive among the region’s Indigenous peoples — even though several have the backing of individual First Nations governments.

One of those is the massive Ksi Lisims LNG plant, in which the Nisga’a Nation is a direct partner.

Co-developed with Texas-based Western LNG, the mega-project will “benefit all Canadians,” said Nisga’a President Eva Clayton.

In 2000, her nation became the first in BC to reach a modern self-government treaty.

“We are co-developing the Ksi Lisims LNG project on land that our nation owns under our treaty,” she told a parliamentary committee on February 24.

“This project is expected to bring in 30 billion [Canadian] dollars [$22bn] in investment, create thousands of skilled careers, and strengthen Canada’s leadership in low-emission LNG.”

‘Elbows up’ meets opposition

But LNG is fiercely opposed by other nearby First Nations.

Tara Marsden is Wilp sustainability director for the Gitanyow Hereditary Chiefs, traditional leaders of the 900-member Gitanyow community.

“We have a lot more concerns and evidence regarding impacts in our territory,” she said.

“The federal government has done zero consultation on their fast-track list and the projects that actually affect our territory.”

Gitanyow oppose the BC projects on the fast-track list as harming their interests.

She said Ottawa cannot ignore First Nations opposition, even if there is support from others like the Nisga’a.

“They have a right to develop in their own territories”, said Marsden. “But if you have maybe 20 to 30 First Nations whose territory would be crossed — and you get maybe three on board — that’s not a resounding consensus.

“They’re just trying to use this small handful of nations to steamroll over everybody else.”

If Canada truly wants to strengthen its sovereignty and economy, she said, it must do so alongside Indigenous people.

“This is something that First Nations across the country have been saying since Carney took the ‘elbows up’ approach,” Marsden said.

“The government has really just ignored that … and actually now back-stopping these mega-projects with taxpayer dollars.”

Free, prior and informed consent

McGill University economics lecturer Julian Karaguesian served for decades in the Department of Finance and Canada’s Embassy in Washington, DC.

He agreed that most Canadians support Carney’s attempt to boost the economy with “nation-building” projects.

“I think they’re a fantastic idea”, he told Al Jazeera. “But we’ve committed to consultations with First Nations, Metis and Inuit people.

“Once we’ve started compromising on economic and social justice … we can create bitterness. First Nations leaders understand the situation we’re in, and I think [Ottawa] can work with them.”

Even on projects endorsed by some First Nations, the international legal principle of “free, prior and informed consent” must still apply to other communities impacted, said Lightfoot.

That’s “not simply a procedural requirement” to rubber-stamp projects, she said.

“It is a substantive right, anchored in Indigenous peoples’ self-determination and their ability to make decisions about matters that affect their lands, communities, and futures.”

And that could risk slowing down Carney’s hopes to speed through projects if there is no Indigenous consensus — potentially tying more divisive ones up in the courts.

“Failure to include Indigenous knowledge and decision-making early in the process,” Lightfoot said, “can undermine the legitimacy and fairness of project approvals.”

Carney’s ratings among First Nations are “mixed,” says AFN’s national chief. One positive, she noted, is his openness to meeting Indigenous leaders raising concerns.

But with many of the prime minister’s economic hopes dependent on building “national interest” infrastructure on First Nations homelands, Woodhouse Nepinak said the relationship needs care.

“Carney is at a crossroads in his personal relationship with First Nations,” she said.

“And we understand First Nations rights are under threat in new ways by this government.”