At least four people have been killed in the eastern Ukrainian city of Kharkiv after a series of Russian attacks.
President Volodymyr Zelenskyy described one of the attacks as a “savage killing”, saying dozens of people had been injured.
It comes after Kyiv embarrassed Moscow when it launched a daring drone raid deep inside Russia last weekend, destroying dozens of bombers.
Meanwhile, attempted US-led peace talks between the two appear to be floundering.
During the attacks on Saturday, Kharkiv mayor Ihor Terekhov said: “Kharkiv is currently experiencing the most powerful attack in the entire time of the full-scale war.”
The first wave of the Russian strike was a large drone-and-missile attack in the early hours of Saturday morning.
Nightly attacks from Moscow have become a routine part of the conflict.
At least three people died and 21 others were injured. There are reports that some people remain trapped underneath the rubble.
Then, in the afternoon, Russia dropped aerial bombs on the city centre, killing at least one person and wounding more.
Ukraine and Russia also accused one another of trying to sabotage a planned prisoner exchange.
Residents reckon with Russian strikes
As emergency workers fought fires at the attack sites in Kharkiv, residents had to deal with the fallout of strikes that could have claimed their lives.
Alina Belous tried to extinguish flames with buckets of water to rescue a young girl trapped inside a burning building, as she called out for help.
“We were trying to put it out ourselves with our buckets, together with our neighbours,” she said.
“Then the rescuers arrived and started helping us put out the fire, but there was smoke and they worried that we couldn’t stay there.
“When the ceiling started falling off, they took us out.”
Vadym Ihnachenko said he initially thought it was a neighbouring building going up in flames – not his own.
He was forced to flee after seeing smoke coming from his building’s roof.
Diplomatic efforts stall
Several other areas in Ukraine were also hit, including the regions of Donetsk, Dnipropetrovsk, Odesa, and the city of Ternopil, Ukrainian foreign minister Andriy Sybiha said.
Russia acknowledged the attacks, but not the deaths, saying it had targeted military sites, while pictures show apartment blocks on fire.
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The regional governor, Oleh Syniehubov, said children were among those injured in the first attack.
While a US-led diplomatic push for peace has led to two rounds of direct peace talks between delegations from Russia and Ukraine, they delivered no significant breakthroughs.
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Later on Saturday, Russia and Ukraine also accused each other of endangering plans to swap 6,000 bodies of soldiers killed in action.
This had been agreed during peace talks in Istanbul, Turkey, on Monday.
