He said more than 84 people were injured in the attack.

"As of now, 31 people are known to have been killed in Sumy by the Russian ballistic missile strike. Among those killed were two children. My condolences to the families and loved ones… More than 84 people have been wounded, including 10 children. All of them are receiving the necessary assistance," Zelenskyy wrote on X.

'World should not stay silent'

Zelenskyy urged the world to break silence on Russia and its acts against Ukraine.

He wrote on X: "It is crucial that the world does not stay silent or indifferent. Russian strikes deserve nothing but condemnation. There must be pressure on Russia to end the war and guarantee security for people. Without truly strong pressure, without sufficient support for Ukraine, Russia will continue dragging this war out."

"It’s now the second month that Putin has been ignoring the U.S. proposal for a full and unconditional ceasefire. Unfortunately, there in Moscow they are convinced they can keep killing with impunity. Action is needed to change this situation," he said.

March proves deadly month for civilians in Ukraine

More than three years after the full-scale Russian invasion of Ukraine, Ukrainian civilians continue to face the devastating consequences of war, with March 2025 proving to be another deadly month.

“The near daily barrage of long-range drones killed and injured scores of civilians across the country last month, and disrupted life for millions more,” said the head of the UN Human Rights Monitoring Mission in Ukraine (HRMMU), Danielle Bell, in the independent human rights team’s latest monthly update. 

The mission was mandated by the UN human rights chief at the invitation of the Ukrainian Government in 2014, to help safeguard rights during the escalating conflict. 

164 Ukrainians killed

With at least 164 Ukrainians killed and 910 injured, March 2025 saw a 50 per cent spike in civilian casualties from the previous month. These numbers represent a 71 per cent increase in civilian casualties compared with March last year, says the latest HRMMU Protection of Civilians Report.

Russian attacks on cities such as Dnipro, Kharkiv, and Sumy, combined with multiple munitions strikes on Dobropillia, exacerbated the high number of casualties in March. 

Kryvyi Rih, located around 65 kilometers from the frontline, was one of the places most heavily affected, suffering five waves of Russian attacks which killed at least six civilians and injured 66. 

Civilian buildings in the city – home town of Ukraine’s President Volodymyr Zelenskyy – including two hotels and a restaurant, were amongst the sites hit. 

Some 29 medical and 50 educational facilities were damaged by Russian armed forces during last month, while two medical centres and six educational facilities were totally destroyed. 

“Hospitals enjoy special protection under international humanitarian law and should not be subjected to attack,” Bell said.

Indiscriminate attacks are prohibited under international humanitarian law, said UN human rights chief, Volker Türk, emphasising that parties to a conflict ought to differentiate military from civilian infrastructures.