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What are depleted uranium munitions? U.K. plans to provide them to Ukraine and Russia isn't happy

Russia threatened to escalate attacks in Ukraine after the British government announced it would provide to Ukraine a type of munition that Moscow falsely claims has nuclear components. 

The armour-piercing rounds are considered 'tank killers' but questions persist about lingering health impacts

A tank parked in a a grassy area in front of white church buildings with gold and blue minarets on the top of the structures.
A destroyed Russian T-72 tank is photographed near Pokrovy Presvyatoyi Bohorodytsi Church, in the city of Svyatohirs'k, in Ukraine's Donetsk region on March 1. (Ihor Tkachov/AFP/Getty Images)

Russia threatened to escalate attacks in Ukraine after the British government announced it would provide to Ukraine a type of munition that Moscow falsely claims has nuclear components. 

The British Defence Ministry on Monday confirmed it would provide Ukraine with armour-piercing rounds containing depleted uranium (DU). 

Such rounds were developed by the U.S. during the Cold War to destroy Soviet tanks, including the same T-72 tanks that Ukraine now faces in its push to break through a stalemate in the east. 

A row of dark, military green bullets with pointed ends.
A row of U.S. Army 25 mm rounds of depleted uranium ammunition, photographed at the base of Charlie Company, 1-22 Battalion, 4th Infantry Division, in Tikrit, Iraq, in February 2004. (Stan Honda/AFP/Getty Images)

Depleted uranium is a byproduct of the process to create the rarer enriched uranium used in nuclear fuel and weapons. 

The rounds retain some radioactive properties, but they can't generate a nuclear reaction like a nuclear weapon would, RAND nuclear expert and policy researcher Edward Geist said. 

That didn't stop the Russians from offering a full-throated warning that the rounds were opening the door to further escalation. In the past, they have suggested the war could escalate to nuclear weapons use. 

Both the British ministry and the White House dismissed the Russian accusations. But the ammunition does carry risks even if it's not a nuclear weapon.

WATCH | Russia criticizes U.K. plan to provide depleted uranium rounds to Ukraine: 

Russia says the U.K. is escalating the situation in Ukraine

2 months ago
Duration 1:59
Russian Foreign Minister Sergei Lavrov called it a 'serious escalation' in response to the U.K.'s intentions to send depleted uranium shells to Ukraine, after President Vladimir Putin condemned the plans.

Use of depleted uranium weapons

Although far less powerful than enriched uranium and incapable of generating a nuclear reaction, depleted uranium is extremely dense — more dense than lead — a quality that makes it highly attractive as a projectile. 

"It's so dense and it's got so much momentum that it just keeps going through the armour — and it heats it up so much that it catches on fire," Geist said. 

When fired, a depleted uranium munition becomes "essentially an exotic metal dart fired at an extraordinarily high speed," RAND senior defence analyst Scott Boston said. 

In the 1970s, the U.S. Army began making armour-piercing rounds with depleted uranium and has since added it to composite tank armour to strengthen it. It also has added depleted uranium to the munitions fired by the Air Force's A-10 close air support attack plane, known as the tank killer. 

The U.S. military is still developing depleted uranium munitions, notably the M829A4 armour-piercing round for the M1A2 Abrams main battle tank, Boston said. 

A rusted tank peppered with whole and the letters D and U spray painted on it.
An Iraqi tank, riddled with holes during the Gulf War and spray-painted with the letters 'DU,' referring to depleted uranium, lies rusting in a scrapyard in the Kuwaiti desert, in this image from Nov. 5, 2002. (Chris Helgren/Reuters)

Russia claims DU munitions would escalate conflict

President Vladimir Putin on Tuesday warned that Moscow would "respond accordingly, given that the collective West is starting to use weapons with a 'nuclear component.'"

The British "have lost their bearings," said Russian Foreign Minister Sergei Lavrov, warning that the munitions are "a step toward accelerating escalation."

Russian Defence Minister Sergei Shoigu said the announcement was "another step, and there aren't so many of them left." 

The White House denounced Russia's claims as disinformation.

"Make no mistake, this is yet another straw man through which the Russians are driving a stake," U.S. National Security Council spokesperson John Kirby said.

Russia also has depleted uranium munitions and just doesn't want Ukraine to have them, too, according to a White House official, who was not authorized to comment on the matter and spoke on condition of anonymity.

Pentagon press secretary Air Force Brig.-Gen. Pat Ryder said Monday that to his knowledge, the U.S. was not sending depleted uranium munitions from its own arsenal to Ukraine. 

WATCH | A Ukrainian soldier explains why the battle for Bakhmut is so important: 

Why a Ukrainian soldier says fighting in Bakhmut is ‘horrible, but necessary'

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Rosemary Barton Live speaks with Ukrainian soldier Roman Trokhymets about life as a sniper on the battlefield and the toll it's taking on him emotionally.

Low-risk but not no-risk

While depleted uranium munitions are not considered nuclear weapons, their emission of low levels of radiation has led the United Nations nuclear watchdog to urge caution when handling and warn of the possible dangers of exposure. 

The handling of such ammunition "should be kept to a minimum and protective apparel (gloves) should be worn," the International Atomic Energy Agency (IAEA) cautions, adding that "a public information campaign may, therefore, be required to ensure that people avoid handling the projectiles. 

"This should form part of any risk assessment and such precautions should depend on the scope and number of ammunitions used in an area."

A warning sign in front of a tank, blurred in the background, reads "Area May Contain Residual Heavy Metal Toxicity, Entry Not Advised."
A warning sign in Klina, Kosovo, in January 2001, cautions 'Area may contain residual heavy metal toxicity, entry not advised' at one of 112 sites where NATO used armour-piercing shells tipped with depleted uranium during the 1999 bombing of the former Yugoslavia. (Darko Bandic/Newsmakers/Getty Images)

The IAEA notes that depleted uranium is mainly a toxic chemical, as opposed to a radiation hazard. 

Particles in aerosols can be inhaled or ingested, and while most would be excreted again, some can enter the bloodstream and cause kidney damage.

"High concentrations in the kidney can cause damage and, in extreme cases, renal failure," the IAEA said. 

The low-level radioactivity of a depleted uranium round "is a bug, not a feature" of the munition, Geist said, and if the U.S. military could find another material with the same density but without the radioactivity it would likely use that instead. 

Where have DU munitions been used? 

Vyacheslav Volodin, the speaker of the Russian parliament's lower house, said supplies of rounds containing depleted uranium could lead to "a tragedy on a global scale that will primarily affect European countries."

Volodin said the use of such U.S. ammunition in conflicts in the Balkan states and Iraq led to "radioactive contamination and a sharp rise in oncological diseases."

Depleted uranium munitions were first used in the 1991 Gulf War, against Iraq's T-72 tanks, and again in the invasion of the U.S.-led invasion of the country in 2003, as well as in Bosnia and Herzegovina, Serbia and in Kosovo. 

U.S. military veterans of those conflicts have questioned whether their use led to ailments they now face, though some studies found there was not conclusive evidence of long-term health effects from depleted uranium exposure, either from inhalation aerosols from gunfire or shrapnel from DU munitions embedded in their bodies.

A man, with his back turned, wears a black t-shirt with a yellow radioactive material symbol and the words "DANGER Radiation Risk" and "Is Depleted Uranium Poisoning Our Troops" printed on it.
An anti-war protester wears a T-shirt questioning the use of depleted uranium in U.S. weapons during a protest in Washington in September 2007. (Nicholas Kamm/AFP/Getty Images)

In Iraq, doctors have claimed there was an increase in cancers and birth defects related to the U.S. military's use of depleted uranium munitions, notably in Fallujah following the 2003 invasion. 

However, questions have been raised about the reliability of research. 

A study published by the National Center for Biotechnology Information said uncertainty remains about possible public health impacts of DU weapons, but the authors suggested U.S. sanctions on Iraq "may have played a role in limiting research and publication on the health impacts of [weaponized] uranium on the Iraqi population." 

A woman wearing a black robe and a headscarf stands in a hospital room next to a child sitting on a bed.
An Iraqi woman and children sit in the leukemia ward of the Al Mansoor Hospital, in Baghdad in September 2002, where children with various forms of cancer, attributed to the 1991 use of depleted uranium munitions by the allies, are being treated. (Oleg Nikishin/Getty Images)

With files from CBC News

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