By ADAM SCHRECK and HANNA ARHIROVA

KYIV, Ukraine (AP) — Russian missile attacks caused a crippled nuclear plant in Ukraine to lose all external power for the second time in five days, increasing the risk of a radiation disaster because critical safety systems need electricity to operate, Ukraine’s state nuclear operator said Wednesday.

On-site monitors from the U.N.’s atomic energy watchdog reported the last remaining outside line to the Russian-occupied Zaporizhzhia Nuclear Power Plant was restored about eight hours later. The war-related interruption nonetheless highlighted “how precarious the situation is” at Europe’s largest nuclear plant, the head of the International Atomic Energy Agency said.

The nuclear scare came amid a flurry of developments in Russia’s 7 1/2-month invasion of Ukraine. Russia’s main domestic security agency said eight people were arrested over an explosion on a bridge that links Russia to the Crimean Peninsula.

The Ukrainian president’s office said strikes Moscow ordered in retaliation for the bridge attack killed at least 14 people died and wounded 34 in the last day. Western officials meeting in Brussels discussed their plans to maintain winter weapon and aid deliveries to Ukraine.

Ukrainian nuclear power operator Energoatom said the Zaporizhzhia plant suffered a “blackout” Wednesday morning when a missile damaged an electrical substation, leading to the emergency shutdown of the plant’s last external power source.

All six of the reactors were stopped earlier due to the war. But they still require electricity to prevent them from overheating to the point of a meltdown that could cause radiation to pour from Europe’s largest nuclear plant. Energoatom said diesel generators were supplying the plant but Russian troops blocked a convoy carrying additional fuel for the back-up equipment.

“Basically what we’ve got here is the weaponization of civil nuclear, perhaps for the first time,” Paul Dorfman, a nuclear expert at England’s University of Sussex said. “And in an increasingly unstable world, it’s important to understand this and what this implies for nuclear worldwide.”

Ukrainian workers later found a way to repair the line and connected the plant to the Ukrainian power grid, the company said. The chief of Energoatom, Petro Kotin, told The Associated Press last month the plant typically had enough diesel on hand to run the generators – “the station’s last defense before a radiation accident” for 10 days.

Western governments, in the wake of the punishing missile and drone strikes Russia carried out across Ukraine this week, were shipping new weapons systems to Ukraine or gearing up to provide more help: The U.S.-led Ukraine Defense Contact Group and NATO defense ministers held meetings in Brussels on Wednesday.

Russia’s Federal Security Service, known by the Russian acronym FSB, said it arrested five Russians and three citizens of Ukraine and Armenia in the attack on the Kerch Bridge. A truck loaded with explosives blew up while driving across the bridge Saturday, killing four people and causing sections of road to collapse.

The span opened four years after Russia annexed Crimea from Ukraine in 2014, serving as a symbol of Moscow’s regional dominance as well as a crucial route for getting military supplies to Ukraine and Russian travelers to a popular vacation destination.

The FSB alleged the detained suspects acted on orders of Ukraine’s military intelligence to secretly move the explosives by a convoluted route into Russia and forge accompanying documents.

The Russian security services have pointed the finger at Ukraine’s intelligence directorate and its head, Kyrylo Budanov. Ukraine’s Defense Ministry on Wednesday dismissed accusations of Ukrainian involvement.

“The entire activity of the FSB and the Investigative Committee is nonsense,” Defense Ministry spokesman Andriy Yusov told reporters.

Russian President Vladimir Putin responded to the blast by ordering missile strikes across Ukraine, where his forces over the last month lost ground in the east and south as Ukraine’s military waged a counteroffensive. Ukrainian authorities said Russian missiles killed 19 people on Monday, including five in Kyiv, the capital.

The bombardment targeted power plants and also hit civilian buildings. Over the past two days, Russian strikes damaged about 1/3 of the country’s energy infrastructure, Ukrainian Energy Minister German Galushchenko said Wednesday.

Ukraine’s presidential office said in a morning update that eight Ukrainian regions in southeast were affected by Russian shelling and attacks involving drones, heavy artillery and missiles in the previous 24 hours, while strikes on central and western parts of Ukraine had ceased.

Kyrylo Tymoshenko, the deputy head of President Volodymyr Zelenskyy’s office, said Russian shelling left at least 14 people dead in the Zaporizhzhia region and the Donetsk region to the east. At least 34 people were injured in five regions, he wrote on Telegram.

More than a dozen missiles were fired at the city of Zaporizhzhia and its suburbs, damaging residential buildings. While part of a larger eponymous region that Moscow has claimed as its own in violation of international law, the city remains in Ukrainian hands. Russian forces control the area about 53 kilometers (33 miles) away by air where the nuclear plant is located.

In Nikopol, a city across the Dnieper River, three people were wounded, including a 6-year-old girl; medical workers say they were in grave condition. Over 30 multi-story residential buildings were damaged in the city of 104,000, as well as private houses, kindergartens, a school, two plants and several shops, authorities said.

In the Donetsk region, Russian forces used tanks to shell the city of Avdiivka, damaging residential buildings. Two air strikes blasted the city of Bakhmut. In total, at least five cities in the region have been shelled, Ukrainian officials reported.

Near the southern city of Mykolaiv, Ukrainian forces shot down nine Iranian Shahed-136 drones and destroyed eight Kalibr cruise missiles, the presidential office said.

“Russian shelling intensifies and subsides, but doesn’t stop, not for a day — the city lives in tension, and the Russians’ main goal appears to be keeping us in fear,” Mykolaiv regional governor Vitali Kim said.

Earlier Wednesday, Ukraine’s southern command said its forces recaptured five settlements in the southern Kherson region, on the western fringe of an arc of Russian-controlled territory in eastern and southern Ukraine.

Kherson, Donetsk, Zaporizhzhia and Luhansk are four regions recently annexed by Russia, a move condemned as illegal under international law by many countries and the U.N. secretary-general.

Despite the advance, Ukrainian military analyst Oleh Zhdanov said Ukrainian forces’ counteroffensive in the south was losing pace, while regrouping in the east to deliver a “powerful blow” on the front line between the cities of Svatove and Kreminna in Luhansk region.

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Yuras Karmanau in Tallinn, Estonia, contributed to this report.

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Follow the AP’s coverage of the war at https://apnews.com/hub/russia-ukraine

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