Power Cuts
Winter Fears
Zelensky said Moscow launched 120 missiles and almost 100 drones, targeting Kyiv as well as southern, central and far-western corners of the country.
The attack, which officials said was one of Russia's largest, came as Moscow's assault neared its 1,000th day, which will be marked at the United Nations on Monday, attended by Ukraine's Foreign Minister Andriy Sybiga.
Civilians were killed in the Mykolaiv, Lviv, Kherson, Dnipropetrovsk and Odesa regions.
Biden's announcement - and the latest devastation - came at a time when Moscow has been steadily advancing in Ukraine's east. The imminent return of Donald Trump to the White House has raised fears over the future of US support for Kyiv.
Many fear a third winter of war will be the toughest yet. Previous Russian attacks have already destroyed half of Ukraine's energy production capacity, Zelensky has warned.
'Peace Through Strength'
Sunday's barrage came two days after German Chancellor Olaf Scholz called Russian President Vladimir Putin for the first time in almost two years, urging the Kremlin chief to end Moscow's devastating offensive.
Ukraine was quick to criticize Berlin's initiative as "attempt at appeasement." On Sunday, it said the latest attack was the Kremlin's real answer.
"This is war criminal Putin's true response to all those who called and visited him recently," Sybiga said.
"We need peace through strength, not appeasement."
Scholz on Sunday defended the call, insisting that Berlin's backing for Kyiv was unwavering.
"Ukraine can count on us," he said before flying to a G20 meeting in Brazil, adding that "No decision will be taken behind Ukraine's back."
But Poland's Prime Minister Donald Tusk joined the backlash on Sunday.
"No one will stop Putin with phone calls. The attack last night, one of the biggest in this war, has proved that telephone diplomacy cannot replace real support from the whole West for Ukraine," Tusk wrote on X.
And French President Emmanuel Macron, speaking from the Mercosur summit in Argentina, said Putin "does not want peace" in Ukraine and "is not ready to negotiate" an end to the war.
"It's a matter for Chancellor Scholz who he speaks to," said British Prime Minister Keir Starmer. "I have no plans to speak to Putin."
He added that the deployment of North Korean troops alongside Russian forces showed Moscow's "desperation", but also had "serious implications for European security."
Civilian Deaths Across Ukraine
Moscow said it had hit all its targets, saying it had aimed for an "essential energy infrastructure supporting the Ukrainian military-industrial complex."
But civilian deaths were reported across the country from the strikes overnight Saturday to Sunday.
Russia said Ukrainian drones attacks had killed a man in its border Belgorod region and a woman - named as local journalist Yulia Kuznetsova - in the border Kursk region.
Kursk leader Alexei Smirnov said she had been reporting on the "situation in the region," where a Ukrainian incursion has displaced thousands of people.
The West and Ukraine says thousands of North Korea soldiers are in Russia, with some in the Kursk region, to reinforce Moscow's forces.