Chernobyl at 40: A disaster contained — and a new threat emerging

PARIS — The rusted Ferris wheel in Pripyat, Ukraine, stands frozen in time, a creaking symbol of the Soviet city abandoned in April 1986.

But exactly four decades after the world’s worst nuclear disaster, the danger is no longer just historical.

Forty years after the explosion of Reactor No. 4 at the Chernobyl Nuclear Power Plant, the site remains one of the most complex nuclear cleanup operations on Earth.

Today, four years into Russia’s invasion of its neighbor, that containment is under strain.

A massive steel arch known as the New Safe Confinement, completed in 2016 at a cost of $2.3 billion, was designed to seal in the radioactive remains of the reactor for a century. Built with international funding and engineering, it covers the original Soviet sarcophagus, itself hastily erected after the explosion.

The stone coffin was meant to withstand time and weather — not missile strikes.

That distinction became clear on Feb. 14, 2025, when a Russian drone struck the upper section of the arch. The impact caused a fire and damaged layers of metal coating and insulation critical to maintaining the structure’s airtight seal.

Inspectors from the International Atomic Energy Agency later concluded that while radiation levels remained stable, the facility lost key elements of its confinement function.

While the strike did not lead to the release of radioactive particles, it narrowed the safety margin.

Inside the structure lies the remnants of the 1986 meltdown, a volatile mix of melted nuclear fuel, radioactive dust and unstable debris. Beneath the arch, the original sarcophagus continues to degrade. Engineers have long relied on the outer shell to prevent the release of radioactive particles into the environment.

If that shell is compromised further, the risk changes dramatically.

“A major strike could disturb the internal structures and release radioactive material,” one site official said in recent reporting by The Times of London, reflecting a growing concern among nuclear experts that the site’s defenses were never built for kinetic threats.

That vulnerability has become a major concern.

During a visit to the exclusion zone in January 2025, Ukrainian officials described to The Washington Times a site under constant pressure. Russian drones regularly cross the airspace above the zone on their way to Kyiv, just 80 miles to the south.

Anti-aircraft positions have appeared among the abandoned apartment blocks of Pripyat, and soldiers now outnumber scientists.

For those tasked with managing the site, the war has reshaped their work and their assessment of the risks it involves.

“For all of us working here, there were two disasters,” said Nadiia Mudryk-Mochalova, an official overseeing the zone. “The one in 1986, and the Russian occupation.”

That occupation, in the very first weeks of the 2022 invasion, has left lasting damage. Russian forces quickly seized the site, looted and destroyed monitoring equipment, and even dug trenches in highly contaminated areas, including the so-called Red Forest.

As the soil was disturbed, radiation levels briefly spiked while monitoring systems were disrupted.

Workers described the aftermath in stark terms.

“Not a single office was left intact,” said Sergey Kireev, head of the state enterprise responsible for radiation monitoring. “Equipment was looted, destroyed, broken.”

The site has since been retaken by Ukrainian forces, but it remains dangerously exposed. Dozens of drones and missiles have passed near or over the exclusion zone since 2024, according to Ukrainian officials and international reporting. Each incident raises the risk of another strike, accidental or otherwise.

Beyond direct impacts, the war has strained Chernobyl’s safety systems, which rely on stable electricity supplies, continuous monitoring and controlled access. Wartime conditions complicate all three.

Repairs are slow and difficult, constrained by radiation levels that limit how long workers can remain in certain areas. Meanwhile, costs are mounting, with estimates for restoring the damaged arch running into the hundreds of millions of dollars.

It’s an unaffordable undertaking for the war-torn country, which faces mounting economic and budgetary pressures.

Even under normal conditions, the site would require decades of careful dismantling and containment. Under fire, this timeline becomes uncertain.

The broader implication is obvious: Nuclear safety systems built in peacetime are not designed for modern conflict.

Nowhere is that new reality more visible than at the Zaporizhzhia Nuclear Power Plant, Europe’s largest, which has been occupied by Russian forces since 2022. There, repeated power cuts and the presence of military equipment have, according to the International Atomic Energy Agency, created a risk of a serious nuclear incident. 

Together, the two sites illustrate a new category of risk: civilian nuclear infrastructure exposed to sustained military pressure.

At Chernobyl, the paradox is stark. Radiation levels today are largely stable. In some parts of the exclusion zone, wildlife has returned, and limited scientific work continues. In a technical sense, the disaster has been contained, but containment is no longer the same as security.

The integrity of the site now depends not solely on engineering feats, but on the trajectory of the high-intensity conflict being fought around it — and sometimes directly overhead.

Four decades after the explosion that sent radioactive fallout across much of Europe, Chernobyl was meant to stand as a warning from history. Instead, it has become a renewed security threat that extends well beyond the borders of Ukraine.