The Friday night strike on the warehouse, which Ukrainian officials said was storing ammunition, sparked massive explosions and fires that swept through dozens of nearby homes and buildings in the village of Myla.
The attack came as Russia has sharply intensified its air campaign recently in the four-and-a-half-year-old war, with air raid sirens wailing repeatedly and explosions and the rumble of air defences resounding across Kyiv throughout the day.
Emergency workers continued to extinguish fires and identify and neutralise explosives at the site, Ukrainian President Volodymyr Zelenskiy said on social media.
At least 52 people were injured, said Tymur Tkachenko, who heads the local regional military administration.
On Saturday, Zelenskiy called the Myla attack "a terrible situation" and a consequence of "terrible negligence on the part of those who stored explosives right next to people".
He said an investigation was underway into why the ammunition came to be kept there.
The escalation was a notable shift in tactics, putting more pressure on Ukraine's already strained air defences while keeping civilians on alert for hours. Previously, daytime attacks on the capital had been relatively rare.
The Defense Ministry in Moscow said on Sunday it was preparing "massive strikes" on Ukraine's energy infrastructure.
It described the planned strikes as retaliation for Kyiv's drone campaign against Russian online retailers Wildberries and Ozon, as well as the country's oil and gas sector.
Kremlin spokesman Dmitry Peskov said large-scale strikes against Ukraine's energy sector would be "an appropriate response" to what he called Ukraine's "path of escalation" and targeting of Russia's civilian economy.
Peskov told Russian state TV that Moscow has been launching "fairly systematic" strikes on what he called Kyiv's military and war-related infrastructure.
In the latest attack Sunday, an Ozon logistics facility was struck and set ablaze by a Ukrainian drone in the Belgorod border region of Russia, with the company saying it feared that there were multiple injuries.
Ukraine said it was attacking Wildberries - the country's largest online retailer, similar to Amazon - because it sells dual-use goods that have aided the military, although the company denies that.
Ukrainian drones also have struck oil refineries and other energy infrastructure, prompting an unprecedented fuel crisis in one of the world's biggest energy producers.
During the war's previous winters, Russia systematically battered Ukraine's power grid, depriving thousands of heat and light. Ukrainian officials have repeatedly warned that the coming winter may prove to be the most challenging since the full-scale invasion began in February 2022.
Also on Sunday, Russia's Defense Ministry said its forces downed or neutralised almost 500 Ukrainian drones launched overnight.
Russian and Ukrainian reports claimed the drone strikes set fire to a major oil refinery in Kirishi, southeast of St Petersburg. The facility is one of Russia's largest refineries and the only one in the country's northwest.
Russian strikes on Kyiv on Saturday killed a two-year-old girl and injured 12 others, Mayor Vitali Klitschko said on Telegram.
In the village of Bilbasovka in eastern Ukraine, a 13-year-old and an adult died after Russian troops dropped bombs on private houses Sunday, according to local official Vadim Lyakh.
A Ukrainian strike Sunday on a mine in Luhansk in Russian-held eastern Ukraine killed an employee, a Kremlin-installed local official said. According to regional head Leonid Pasechnik, five others were injured across the province.
In Russia, Ukrainian drone strikes injured at least four people in the border regions of Kursk and Belgorod, local authorities said.
10°C