On Wednesday, 13 people died and 10 were wounded when Russian forces fired rockets at the southeastern Ukrainian town of Marhanets from the area of a nuclear power plant they had captured in the Dnipropetrovsk region, news agencies reported.
"The armed forces of Ukraine, our intelligence and our law enforcement agencies will not leave today's Russian shelling of Dnipropetrovsk region unanswered," Zelensky said in a video address late on Wednesday, as cited by the ukrinform.net website.
He added: "Thirteen people died as a result of the occupiers' attack on Marhanets. More than 10 are wounded; five are in grave condition."
Zelensky also said in his message that the attack highlighted the need for the West to supply more powerful weapons to the Ukrainian military, according to ukrinform.net.
"The more losses the occupiers suffer, the sooner we will be able to liberate our land and guarantee Ukraine's security," he said.
"This is what everyone who defends our state and helps Ukraine should think about: how to inflict the greatest possible losses on the occupiers in order to shorten the war,” he added.
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Source: IAR, PAP, Reuters, ukrinform.net