According to the Sumy city administration, two ballistic missiles struck the city centre, causing extensive damage.
Rescue operations are ongoing, with emergency services working to retrieve survivors from the rubble.
Footage posted online by residents shows widespread devastation, with lifeless bodies lying in the streets following the strikes.
In a statement released in response to the attack, Ukrainian President Volodymyr Zelensky accused Russia of deliberately targeting civilians.
Russia is "taking the lives of ordinary people. [...] "And this is on a day when people go to church: Palm Sunday, the feast of the Lord's Entry into Jerusalem," Zelensky said on X.
"The world must respond firmly. The United States, Europe, everyone in the world who wants this war and these killings to end," the Ukrainian leader added.
The strike on Sumy comes just a week after a similar Russian missile attack on Kryvyi Rih, Zelensky’s hometown, left 20 people dead, including nine children. That attack also injured 75 others.
(ał)
Source: IAR, PAP