KYIV, Ukraine >> Ukraine’s capital was subjected to the largest drone attack since the start of Russia’s war, local officials said, as Kyiv prepared to mark the anniversary of its founding on Sunday. At least one person was killed, but officials said scores of drones were shot down, demonstrating Ukraine’s air defense capability.

Russia launched the “most massive attack” on the city overnight Saturday with Iranian-made Shahed drones, said Serhii Popko, a senior Kyiv military official. The attack lasted more than five hours, with air defense reportedly shooting down more than 40 drones.

A 41-year-old man was killed and a 35-year-old woman was hospitalized when debris fell on a seven-story nonresidential building and started a fire, Kyiv Mayor Vitali Klitschko said.

Debris from a drone damaged the building of the Ukrainian Society of the Blind. On Sunday morning, organization member Volodymyr Golubenko came to pick up his things. He was helped by his son Mykola, who searched for his father’s belongings among the rubble and at the same time tried to describe to his father what his office looks like now.

“This wall on the right is destroyed and on left also,” said Mykola to his father.

Volodymyr Golubenko worked at this place for more than 40 years. He says it is a home for many blind people, because they come here to talk and support each other.

“If you don’t even have a job, it’s difficult to get a job now, because these events (war) have been going on since last year. At least people come here to chat,” said Volodymyr.

Like Golubenko, many people in his district heard the sound of Shahed drones for the first time. Among them was 36-year-old Yana, who has three boys. The family hid in a corridor all night.

“Something started to explode above us. The children ran here in fear,” said Yana.

Ukraine said that Saturday night was also record-breaking in terms of Shahed drone attacks across the country. Of the 59 drones launched, 58 were shot down by air defense systems, according to the military’s General Staff.

Russia has repeatedly launched waves of drone attacks against Ukraine, but most are shot down. Ukraine has also claimed this month to have downed some of Russia’s hypersonic Kinzhal missiles, which Russian President Vladimir Putin has touted as providing a key competitive advantage.

In the northeastern Kharkiv province, regional Gov. Oleh Syniehubov said a 61-year-old woman and a 60-year-old man were killed in two separate shelling attacks.

Kyiv Day marks the anniversary of the city’s official founding. The day is usually celebrated with live concerts, street fairs, exhibitions and fireworks. Scaled-back festivities were planned for this year, the city’s 1,541st anniversary.

The timing of the drone attacks was likely not coincidental, Ukrainian officials said.

“The history of Ukraine is a long-standing irritant for the insecure Russians,” Ukraine’s chief presidential aide, Andriy Yermak, said on Telegram.

“Today, the enemy decided to ‘congratulate’ the people of Kyiv on Kyiv Day with the help of their deadly UAVs (unmanned aerial vehicles),” Popko also wrote on the messaging app.

Local officials in Russia’s southern Krasnodar region said that air defense systems destroyed several drones as they approached the Ilsky oil refinery. The Russia-backed governor of Luhansk province in Ukraine’s far east, Leonid Pasechnik, said two people were killed Sunday in Ukrainian shelling of the town of Almaznaya.

Russia’s southern Belgorod region, bordering Ukraine, also came under attack from Ukrainian forces on Saturday, local officials said. Regional Gov. Vyacheslav Gladkov reported Sunday that a 15-year-old girl and a 17-year-old boy were wounded in the shelling.

Drone attacks against Russian border regions have been a regular occurrence since the start of the invasion in February 2022, with attacks increasing last month. Earlier this month, an oil refinery in Krasnodar was attacked by drones on two straight days.

Ukrainian air defenses, bolstered by sophisticated Western-supplied systems, have been adept at thwarting Russian air attacks — both drones and aircraft missiles.

Earlier in May, Ukraine prevented an intense Russian air attack on Kyiv, shooting down all missiles aimed at the capital. The bombardment, which additionally targeted locations across Ukraine, included six Russian Kinzhal aero-ballistic hypersonic missiles, repeatedly touted by Russian President Vladimir Putin as providing a key strategic competitive advantage and among the most advanced weapons in his country’s arsenal.

Sophisticated Western air defense systems, including American-made Patriot missiles, have helped spare Kyiv from the kind of destruction witnessed along the main front line in Ukraine’s east and south. While most of the ground fighting is stalemated along that front line, both sides are targeting other territory with long-range weapons.

Against the backdrop of Saturday night’s drone attacks, Russia’s ambassador to the U.K., Andrei Kelin, warned of an escalation in Ukraine. He told the BBC on Sunday his country had “enormous resources” and it was yet to “act very seriously,” cautioning that Western supplies of weapons to Ukraine risked escalating the war to a “new dimension.” The length of the conflict, he said, “depends on the efforts in escalation of war that is being undertaken by NATO countries, especially by the U.K.”

Kelin’s comments are typical of Russian officials’ rhetoric with regard to Moscow’s military might, but contradict regular reports from the battlefield of Russian troops being poorly equipped and trained.

Also on Sunday, the death toll from Friday’s missile attack on the central Ukrainian city of Dnipro, the regional capital of the Dnipropetrovsk province, rose to four. Regional. Gov. Serhii Lysak said that three people who were considered missing were confirmed dead. There were 32 people, including two children, wounded in the attack, which struck a building containing psychology and veterinary clinics.