Ukraine’s military says it has struck the base of the Russian missile brigade behind Sunday’s devastating attack on Sumy.
A Russian assault on the city killed 35 people and injured at least 119. Children were among the dead and wounded.
The Ukrainian military has now said it has struck a base of “the 448th missile brigade of the Russian occupiers”.
In a statement on messaging app Telegram, it said the base was “hit [and] a secondary detonation of ammunition was recorded”.
“The results of the strike are being clarified,” it added.
Volodymyr Zelenskyy previously shared videos of the aftermath of Russia’s Palm Sunday attack, showing dead bodies in the middle of a street in Sumy.
The Ukrainian president said “only scoundrels can act like this” and called for “tough reaction from the world” in posts on social media.
Meanwhile, Ukraine‘s foreign ministry said one of the children injured was a baby girl born this year, adding “even newborns are targets for Russia’s crimes”.
NATO on Tuesday reaffirmed its “unwavering” support for Ukraine as the alliance’s secretary-general visited the country.
As he met with Mr Zelenskyy at a hospital in Odesa, Mark Rutte said: “I’m here today because I believe Ukraine’s people deserve real peace, real safety and security in their country, in their homes.”
Mr Rutte also said he and Mr Zelenskyy had discussed the Trump administration’s peace talks with both Russia and Ukraine.
“These discussions are not easy – not least in the wake of this horrific violence – but we all support President Trump’s push for peace,” he said.
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His comment came after Mr Trump accused Ukraine of starting the war with Russia.
Rebutting this, Mr Rutte added: “Russia is the aggressor, Russia started this war. There’s no doubt.”
It also follows Russian and Ukrainian diplomats accusing each other of violating a tentative US-brokered deal to pause strikes on energy infrastructure.
“The Ukrainians have been attacking us from the very beginning, every passing day, maybe with two or three exceptions,” Sergey Lavrov, Russia’s foreign minister, said, adding that Moscow would provide a list of Kyiv’s attacks from the past three weeks.
Andrii Sybiha, his Ukrainian counterpart, dismissed the claim saying on Saturday that Russia launched “almost 70 missiles, over 2,200 [exploding] drones, and over 6,000 guided aerial bombs at Ukraine, mostly at civilians” since agreeing to the limited pause on strikes.