It's "terrible to have victims of shooters in peaceful times," Zelenskyy said while speaking at a news conference Tuesday at the World Economic Forum in Switzerland.
"I would like to express my condolences to all of the relatives and family members of the children who were killed in an awful shooting in Texas in a school," Zelenskyy said. "The people of Ukraine share the pain of the relatives and friends of the victims and all Americans."
Authorities said a gunman killed 19 children and two teachers at Robb Elementary School on Tuesday in Uvalde, a small community about an hour from the Mexican border.
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An 18-year-old male, armed with a rifle, shot his grandmother before going to the school and opening fire in the state's deadliest shooting in modern history. It was the country's third mass shooting within weeks, according to Texas Department of Public Safety Sgt. Erick Estrada.
In Ukraine, almost 250 children have been killed since the Russian invasion began in February, according to U.N. humanitarian agency figures shown earlier this month.
"I feel it is my personal tragedy when children are killed in Texas, and now in my country Russian military is killing our children," Zelenskyy said.
This article originally appeared on USA TODAY: Ukraine's Volodymyr Zelenskyy tells Texas families we 'know your pain'