Ukrainian President Volodymyr Zelensky meets with U.N. atomic energy chief Rafael Mariano Grossi during a visit to Zaporizhzhia, Ukraine, on Monday. Efrem Lukatsky/Associated Press

ZAPORIZHZHIA, Ukraine — The U.N.’s atomic energy chief warned during a meeting Monday with Ukrainian President Volodymyr Zelensky that the perilous situation at Europe’s largest nuclear plant “isn’t getting any better” as relentless fighting in the area keeps the facility at risk of a disaster.

The Zaporizhzhia Nuclear Power Plant’s six reactors are in shutdown and it is receiving the electricity it needs to prevent a reactor meltdown through just one remaining power line. It has on occasion had to switch to emergency diesel generators to power its essential cooling systems.

In a meeting with Zelensky in southern Ukraine covered exclusively by The Associated Press, International Atomic Energy Agency Director-General Rafael Mariano Grossi said the situation at the plant remains tense because of the heavy military presence around it and a blackout that recently struck the facility, something that has occurred repeatedly since Russian forces took it over last year.

Grossi plans to visit the plant this week for the second time following Russia’s invasion 13 months ago. The Vienna-based agency has staff permanently deployed at the plant since Grossi’s last visit in September.

Earlier this month, fighting interrupted power supply to the plant for half a day, forcing staff to activate backup generators.

Grossi had expressed alarm at that development.

“Each time we are rolling a dice,” he told his agency at the time. “And if we allow this to continue time after time, then one day our luck will run out.”

Grossi and Zelensky met in the city of Zaporizhzhia, which is in Ukrainian-held territory, about 50 kilometers (30 miles) northeast of the nuclear plant with the same name.

The IAEA said in January it was placing teams of experts at all four of Ukraine’s nuclear power plants to reduce the risk of accidents, including the now-closed Chernobyl plant whose deadly nuclear accident in 1986 spread fallout over much of Europe.

Ukraine’s President Volodymyr Zelensky gets out of a car as he arrives for a visit to Zaporizhzhia, Ukraine, on Monday. Efrem Lukatsky/Associated Press

Grossi emphasized that his seventh trip to Ukraine underlined his commitment and support for “as long as it takes.”

Also attending the meeting were other IAEA officials, the head of the presidential office, Andriy Yermak, and the head of nuclear operator Energoatom, Petro Kotin.

While in Zaporizhzhia, Zelensky also inspected military positions in the partially-occupied province and awarded soldiers military honors. He visited wounded soldiers at a hospital and an apartment building that Kyiv claims was hit by a missile on Wednesday, killing at least one person and injuring more than 30.

Residents were still shocked by the experience.

“It’s terrifying. I cannot find the words to tell you,” said Hanna Budkova, 39, who was in a busy playground in front of the apartment block with her nearly 2-year-old daughter. “I’m afraid to go anywhere near the windows.”

Zelensky later visited Nikopol, a frequently shelled city across the Dnieper River from the nuclear power plant, according to the presidential office.

Elsewhere, two people were killed and 29 wounded Monday when Russian forces shelled the city of Sloviansk, in the partially occupied eastern Donetsk region, officials said.

Video footage of the aftermath showed damaged residential buildings, debris in the streets and vehicles on fire. Zelensky described the attack as “terrorism.”

Russia has denied targeting residential areas even though artillery and rocket strikes have hit Ukrainian apartment buildings and civilian infrastructure daily during the war.

The Sloviansk attack followed a typical pattern of long-range shelling adopted by the Kremlin’s forces, especially in recent months as the fighting became deadlocked during the winter.

In the eastern Donetsk region, about 10 cities and villages were shelled by Russian forces over the previous 24 hours, Ukraine’s presidential office reported.

Russian missiles hit the city of Avdiivka, damaging residential buildings, a hotel and a courthouse, it said.

Avdiivka Mayor Vitali Barabash said utility companies are being evacuated from the front-line city, as it “resembles more and more a landscape from post-apocalyptic movies.”

Attacks also intensified in the Zaporizhzhia region, where 14 settlements on the front line were shelled, authorities said.

In the partially occupied Kherson region, the Ukrainian-controlled part of the province was bombarded 20 times, wounding four people, the presidential office said.

Several explosions shook the Russia-occupied city of Melitopol in the Zaporizhzhia region, damaging a building where Russian security forces are quartered, said the exiled elected mayor Ivan Fyodorov. The Russian-installed authorities said “artillery shelling” of Melitopol partially destroyed a vocational school building, damaged several other buildings and wounded four people.

Earlier, Zelensky met in Kyiv with British actor Orlando Bloom, according to Yermak, the head of the presidential office. Bloom, a UNICEF goodwill ambassador, arrived over the weekend and visited its suburb of Irpin.

At his meeting with Zelensky, Bloom said “he was struck by the courage and resilience of Ukrainians, who despite the war remain strong,” Yermak wrote.

Bloom “will support projects to provide humanitarian assistance and restore infrastructure, focused on ensuring the interests of Ukrainian children,” the official said.

German Chancellor Olaf Scholz said Monday at a meeting in the Netherlands that Germany has fulfilled its promised delivery of 18 advanced Leopard 2 battle tanks to Ukraine. Canada, Norway and Poland also have sent such tanks to Ukraine.