Chernobyl Under Fire: European Nuclear Risk in 2025

Ukraine's Zelensky has accused Moscow of "nuclear terrorism" as the world marks 40 years since Chernobyl—a stark reminder that the site, already the scene of humanity's worst civil nuclear disaster, now sits in the crosshairs of a modern conflict that has left its protective shell damaged and its containment uncertain.

The Novo Confinamento Seguro (NCS), a €500M structure meant to last a century, was breached by a Russian drone strike in February 2025—leaving a 6-meter hole that compromised its containment functions. This development has sparked urgent international concern and action.

Why This Matters

• Canada pledged 8M Canadian dollars (roughly €5M) this week for urgent repairs, joining a €500M international fundraising push led by the European Bank for Reconstruction and Development (EBRD) to restore full protective capacity by 2030.

• For Portugal-based observers tracking European energy security and nuclear risk, this serves as a cautionary tale on how geopolitical instability can turn decades-old hazards into active threats—even in ostensibly "safe" decommissioned zones.

• Russia currently occupies the Zaporizhzhia nuclear plant (Europe's largest) and has repeatedly sent drones over Chernobyl, underscoring the nuclear blackmail dimension of the war in Ukraine.

A Disaster That Never Stopped

On 26 April 1986, reactor 4 at Chernobyl exploded during a botched safety test, releasing radioactive isotopes that spread across Europe—reaching as far as Japan, according to anti-nuclear groups. The official Soviet death toll was 31, but estimates now range from 4,000 to hundreds of thousands when accounting for radiation-induced cancers and chronic illnesses. The Iberian Anti-Nuclear Movement (MIA), which includes Portuguese and Spanish environmental organizations, reminded the public this week that radioactive contamination still affects ecosystems, food chains, and human communities four decades later.

Among the most documented health impacts: thyroid cancer in children exposed to contaminated milk; cardiovascular disease in 63% of "liquidators" (the cleanup crews); neurological disorders; and chronic lung conditions. One liquidator, Petro Hurin, now 76, told researchers in 2026: "No person from Chernobyl has good health." Disability rates among that cohort have surged over the decades, illustrating how radiation's toll compounds over time.

Between 130 and 150 people—mostly elderly women—still live illegally inside the 30-kilometer Exclusion Zone, and some displaced Ukrainians have even moved to its fringes seeking refuge from the current war. Radiation levels in parts of the zone permit short stays, but vast quantities of radioactive material remain entombed inside the reactor.

The War That Cracked the Shield

The NCS was completed in 2019 with funding from 45 countries, designed to seal reactor 4 for 100 years and allow the gradual dismantling of the unstable Soviet-era "sarcófago" beneath. That plan hit a wall on 14 February 2025 when a Russian Shahed-136 (Geran-2) drone, armed with a warhead, pierced both the outer and inner layers of the arch, igniting a fire that smoldered for weeks.

By December 2025, the International Atomic Energy Agency (IAEA) confirmed the structure had lost its primary safety functions—the ability to contain radioactive material and to safely support the dismantling of unstable inner structures. While load-bearing elements and monitoring systems escaped permanent damage, the IAEA warned that without comprehensive restoration, the arch's projected lifespan could shrink and the critical decommissioning timeline could slip, raising the specter of renewed radiation risk.

Temporary patches were applied before winter to prevent further deterioration, but full restoration won't be complete until 2030, at an estimated cost between €500M and €576M. French engineering firms Bouygues Travaux Publics and VINCI Construction Grands Projets, which originally built the arch, are now leading damage assessments and developing a repair strategy.

What This Means for European Nuclear Policy

For residents in Portugal, where the Movimento Ibérico Antinuclear (MIA) has long opposed nuclear energy, the Chernobyl anniversary underscores a persistent argument: "There is no safe nuclear power, only risks that sooner or later materialize." The group pointed out that the radioactive cloud from 1986 reached the Iberian Peninsula, and that mushrooms and wild boar in parts of Europe remain contaminated to this day.

Yet the European Union has included nuclear energy in its sustainable energy taxonomy, and countries like France and Poland are expanding their reactor fleets in the name of climate action and energy independence. The United States Department of State this week issued a statement emphasizing that "nuclear power must remain in responsible hands" and that the disaster "changed forever how the world thinks about nuclear safety," spurring stricter international standards and transparency protocols.

Pope Francis, speaking from the Apostolic Palace, called for "discernment and responsibility" in every use of atomic energy, stating that Chernobyl "marked humanity's conscience" and remains "a warning about the risks inherent in increasingly powerful technologies." His remarks resonated with those who see the 40th anniversary as more than historical commemoration—it's a live policy debate.

Russia's Posture: Homage and Denial

Russia's state nuclear agency, Rosatom, marked the anniversary by honoring the 600,000 technicians, soldiers, firefighters, and medics who contained the initial explosion. Director Alexei Likhachev insisted that "a Chernobyl-scale scenario in Russian reactors has been ruled out" thanks to comprehensive safety overhauls. He praised the "heroic work" of liquidators but made no mention of the February 2025 drone strike—an omission Ukraine seized upon.

President Zelensky denounced the regular drone overflights of Chernobyl and accused Moscow of pushing the world "once again to the brink of a man-made catastrophe." Ukraine currently operates 15 nuclear reactors across four active plants; the Zaporizhzhia complex, Europe's largest, has been under Russian military occupation since early 2022, a fact that has alarmed the IAEA and Western capitals alike.

International Aid and Long-Term Cleanup

Canada's new pledge brings its total Chernobyl-related assistance since the mid-1990s to more than 116.8M Canadian dollars. The EBRD is coordinating a broader international fundraising drive, aiming to secure around €500M by the end of 2027 to cover emergency repairs and enable the resumption of decommissioning work on the original sarcophagus.

Beyond containment, Ukraine and the IAEA are advancing plans to transform the Exclusion Zone into a renewable energy hub, with solar farms and bioenergy projects already in pilot stages. A geological repository for high-level nuclear waste and spent fuel is also in development—though the war has repeatedly interrupted construction schedules and supply chains.

The Geopolitical Calculus

For Portugal and other EU member states, Chernobyl's 40th anniversary arrives at a moment when Europe is recalibrating its energy mix in response to climate targets and geopolitical volatility. The fact that a €500M structure can be compromised by a single drone strike raises uncomfortable questions about the resilience of civilian nuclear infrastructure in contested zones—and whether such facilities can ever be fully insulated from the logic of war.

While Portugal itself has no nuclear plants, its energy grid is interconnected with Spain (which operates seven reactors), and Iberian environmental groups have long warned that a severe incident beyond the border could affect air, water, and food supplies across the peninsula. The MIA statement this week echoed that concern, reminding Portuguese readers that "the Chernobyl cloud reached Spain and even Japan" and that radioactive contamination persists in ecosystems and food chains decades later.

Looking Ahead

Ukraine's government announced memorial ceremonies in Kyiv and other cities, including moments of silence, film screenings, and wreath-laying. Similar observances took place in Belarus and other former Soviet republics still grappling with fallout from the 1986 explosion. The U.S. State Department, in its own statement, underscored that Chernobyl "changed forever how the world thinks about nuclear safety" and spurred the creation of "more rigorous international standards and better safety protocols."

Yet as the NCS repair timeline stretches to 2030 and Russian drones continue to probe Ukrainian airspace, the lesson of Chernobyl is less about what happened 40 years ago than about what could happen next. For policymakers in Lisbon and across Europe, the takeaway is clear: nuclear risk management must account not only for engineering failure but for deliberate acts of aggression—a variable that no sarcophagus, no matter how sophisticated, was designed to withstand.