ALSO SEE: Russia Pounds Ukraine in Heaviest Wartime Drone Attack Over Two Days

Russian forces launched a prolonged combined attack on Ukraine's critical and civilian infrastructure on the afternoon of May 13, Ukraine's President Volodymyr Zelensky said.

The attacks killed at least 14 people and injured over 80 others, including children.

In a post on social media at 5:45 p.m. Kyiv time, Zelensky said Russia had launched at least 800 drones since the beginning of the day, while additional waves of drones were still entering Ukrainian airspace.

Zelensky called the attack "one of the longest massive Russian attacks against Ukraine," saying Moscow was deliberately trying to "spoil the overall political atmosphere" during U.S. President Donald Trump's visit to China.

The president also warned, citing Ukrainian intelligence, that Russia could follow the drone waves with missile strikes to overwhelm Ukraine's air defenses and inflict "as much grief and pain as possible."

Ukraine's Air Force said that air defense units damaged or destroyed 710 Russian drones during the daytime attack. From 8 a.m. to 6:30 p.m. local time on May 13, Russia launched 753 drones across nearly every region of the country.

Combined with drones launched the previous night (139 drones overnight on May 13), Russia attacked Ukraine with over 892 drones, the Air Force said.

The first air raid sirens sounded around 11:00 a.m. local time in several Ukrainian regions, after which authorities in central, western, and southern Ukraine reported explosions in populated areas, casualties, and air defense activity.

At least one Ukrainian air alert tracker reported roughly 200 Shahed-type drones in Ukrainian airspace. As of 12:10 p.m., the Air Force detected eight groups of Shahed-type drones still in the air, including a fresh squadron coming in from the Black Sea.

A Ukrainian monitoring channel "Monitor" published a map at around 12:30 p.m. indicating that groups of long-range drones entered Ukrainian airspace from Belarus, flying over the Chornobyl area toward the country's northwest.

Another group of drones entered Ukraine from the Black Sea and headed west toward the Ivano-Frankivsk, Chernivtsi, and Ternopil oblasts, according to the monitoring channel.

In western Rivne Oblast, a Russian drone strike hit a residential building, killing three people and injuring six others, Ukraine's Emergency Service said.

In Volyn Oblast, Russian forces struck the regional center of Lutsk and the city of Kovel, injuring at least five people. In Lutsk, a non-residential building was struck. In Kovel, an attack near a critical infrastructure facility resulted in damage to a nearby residential building and a vehicle, Governor Roman Romaniuk said.

Three more people suffered injuries in a separate Russian attack on the Smila community in Cherkasy Oblast, according to the local military administration.

In Kharkiv Oblast, attacks killed one victim and injured three others. Gas infrastructure in the region also sustained damage.

A significant number of the drones appeared to be heading farther south and west toward the central Ukrainian city of Khmelnytskyi. At least three people were injured in a Russian drone attack on Khmelnytskyi Oblast and hospitalized in moderate condition, according to Khmelnytskyi Mayor Oleksandr Symchyshyn.

A Russian drone strike on Odesa injured at least two people and sparked a blaze in a courtyard, with several cars catching fire, Odesa Oblast Governor Oleh Kiper said. A fragment of a drone fell onto the roof of a nine-story building, Kiper added.

In Kherson Oblast, one person was killed and at least 27 injured as a result of Russian attacks. Russian drones targeted a bus in the regional center and a minibus in Bilozerka, injuring passengers. In the city of Kherson, a double-tap strike injured two emergency responders.

In Dnipropetrovsk Oblast, eight people were killed and 11 wounded, according to Governor Oleksandr Hanzha. Teenagers are among the injured. Infrastructure, homes, businesses, and vehicles were damaged. A gas pipeline in Kryvyi Rih was also damaged.

The western city of Uzhhorod in Zakarpattia Oblast, located in Ukraine's far west near the borders with Slovakia and Hungary, also came under Russian attack, with local residents reporting hearing explosions. It marked the first time since the start of the full-scale war that the city had been targeted by Russian strikes, and the most massive drone attack against the region since the invasion began.

Critical infrastructure in several districts was reportedly struck.

The city of Zhovkva in Lviv Oblast was also targeted in the Russian mass attack, with a critical infrastructure facility hit, Mayor Oleh Volskyi said. The mayor added that the city lost power following the strike.

Russian forces struck a residential building in Ivano-Frankivsk, Mayor Ruslan Martsinkiv said. Later, regional Governor Svitlana Onyshchuk reported that the strike injured at least 10 people, including two teenagers. Four victims have been hospitalized.

The attacks also damaged an administrative building and other residential buildings in Ivano-Frankivsk and the surrounding region, she said.

Ukraine's Air Force warned shortly before noon that drones were heading toward Kyiv from the north, around the time air raid sirens sounded across the capital. Explosions from air defense activity were heard shortly afterward.

According to Kyiv Mayor Vitalii Klitschko, debris from a downed drone fell in the Obolon district. No casualties have been reported.

Following the start of the large-scale drone strike, HUR said Russia had launched a "combined, prolonged air strike on critical infrastructure" across Ukraine.

The first wave consisted of a large number of strike drones intended to overwhelm Ukraine's air defenses and hit civilian targets. Yet Russian forces plan to follow up with a significant number of air- and sea-launched cruise missiles, as well as ballistic missiles, according to HUR.

The agency said Kremlin targets could include critical infrastructure and essential services in major cities, including energy facilities, defense industry enterprises, and government buildings.

Russian attacks also heavily targeted Ukraine's railway infrastructure, with 23 strikes recorded on railway facilities over the course of May 13, Zelensky’s advisor Dmytro Lytvyn told journalists.

According to Lytvyn, railway monitoring teams managed to stop and evacuate trains in advance, preventing passenger casualties. One railway employee suffered minor injuries while heading to a shelter, while two railway workers were killed and another injured in the western city of Zdolbuniv while off duty during an attack on the city.

The strikes damaged three locomotives, seven commuter rail cars, eight freight cars, five traction substations, five depots, and two bridges, though railway traffic continued across the network, Lytvyn said.

At around 10 a.m. local time, President Volodymyr Zelensky said more than 100 Russian drones were in Ukrainian airspace, warning that further waves of attacks could follow those carried out overnight.

The president added that 14 regions came under attack the previous day, and that overnight Russian forces struck residential and railway infrastructure in Dnipropetrovsk and Kharkiv oblasts, port infrastructure in Odesa Oblast, and energy facilities in Poltava Oblast.