At least seven people have been killed including two children during intense Russian drone and missile strikes on Ukraine, officials say.
A kindergarten was hit in Ukraine's second biggest city Kharkiv and there was widespread damage in Kyiv. Children were among the 27 people wounded.
Hours earlier, US President Donald Trump said his plans for an imminent summit in Budapest with Russia's Vladimir Putin had been shelved as he did not want a wasted meeting.
President Volodymyr Zelensky said the attacks proved Moscow had not come under enough pressure for its continued war.
The Kremlin has rejected calls for a ceasefire along the current front lines made both by Trump and European leaders.
However, Russian officials said on Wednesday that preparation for a Trump-Putin summit was continuing, disputing the US president's assessment that it had been put on hold.
Both public and private efforts to stake claims in ongoing discussions have created a rift in responses among leaders trying to address the escalating violence and humanitarian crisis emerging from the conflict.
The bloodshed and disruption in civilian life continue to raise concerns both in Ukraine and beyond, as further technological advancements in warfare are unveiled.
