This comes after Ukrainian officials announced that their troops had recovered a portion of the eastern battlefield city of Sievierodonetsk in a counter-offensive against Russia the day before.
Russia focused its attacks in Kyiv from February 25 to March 31 in order to force the Volodymyr Zelenskyy administration to capitulate and install a Russian puppet regime.
However, Ukrainian forces, led by Zelenskyy, who refused to flee, inflicted heavy losses on the Russian military, and after a month, Putin's men changed their focus to retaking the Donbas region, which includes the Ukrainian republics of Luhansk and Donetsk.
As of early Sunday, at least one person had been admitted to the hospital, but no deaths had been reported, according to Klitschko. According to other Ukrainian officials, the Russian bombing appeared to be aimed against the railway system.
Russia has concentrated its forces at Sievierodonetsk, an industrial city, for one of the war's largest land engagements.
Serhiy Gaidai, the governor of the Luhansk region, which contains Sievierodonetsk, claimed Ukrainian forces had retaken nearly half of the city from Russian troops.
"It had been a difficult situation because the Russians controlled 70% of the city, but they have been pushed back in the last two days," Gaidai said on Ukrainian television. "The city is now divided in two, more or less."
Ukrainian counter-attacks in Sievierodonetsk over the past 24 hours, according to the British defence ministry, are likely to stifle any operational momentum Russian forces had previously achieved.
"The situation is tight, complicated," Mayor Oleksandr Stryuk said on national television on Saturday, adding that food, fuel, and medicine were in limited supply.
"Our military is putting out every effort to force the enemy out of the city," he said.
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