Local residents ride bicycles past flattened civilian cars on a street in the town of Bucha, in Kyiv region. Reuters

He issued the warning as the humanitarian crisis in the encircled city of Mariupol deepened, with Russian forces blocking evacuation operations for the second day in a row, and the Kremlin accused the Ukrainians of launching a helicopter attack on a fuel depot on Russian soil.

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Ukraine denied responsibility for the fiery blast, but if Moscow’s claim is confirmed, it would be the war’s first known attack in which Ukrainian aircraft penetrated Russian airspace.

"Certainly, this is not something that can be perceived as creating comfortable conditions for the continuation of the talks,” Kremlin spokesman Dmitry Peskov said, five weeks after Moscow began sending upwards of 150,000 of its own troops across Ukraine’s border.

Ukrainian President Volodymyr Zelensky speaks in Kyiv. File photo

Russia continued withdrawing some of its ground forces from areas around Kyiv after saying earlier this week it would reduce military activity near the Ukrainian capital and the northern city of Chernihiv.

"They are mining the whole territory. They are mining homes, mining equipment, even the bodies of people who were killed,” Zelensky said in his nightly video address to the nation. "There are a lot of trip wires, a lot of other dangers.”

He urged residents to wait to resume their normal lives until they are assured that the mines have been cleared and the danger of shelling has passed.

While the Russians kept up their bombardment around Kyiv and Chernihiv, Ukrainian troops exploited the pullback on the ground by mounting counterattacks and retaking a number of towns and villages.

Ukrainian soldiers carry a body of a civilian from the destroyed bridge in Irpin close to Kyiv, Ukraine. AP

Still, Ukraine and its allies warned that the Kremlin is not de-escalating to promote trust at the bargaining table, as it claimed, but instead resupplying and shifting its troops to the country’s east. Those movements appear to be preparation for an intensified assault on the mostly Russian-speaking Donbas region in the country's east, which includes Mariupol.

Zelensky warned of difficult battles ahead as the Russians redeploy troops. "We are preparing for an even more active defense,” he said.

He did not say anything about the latest round of talks, which took place Friday by video. At a round of talks earlier in the week, Ukraine said it would be willing to abandon a bid to join NATO and declare itself neutral — Moscow’s chief demand — in return for security guarantees from several other countries.

The invasion has left thousands dead and driven more than 4 million refugees from Ukraine.

Associated Press