Intense Russian drone and missile strikes on cities in Ukraine have left at least six people dead, including two children, President Volodymyr Zelensky has said.

Another 21 people were wounded, in another night of attacks that he said proved Moscow had not come under enough pressure for its continued war.

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.

The Kremlin has rejected calls for a ceasefire along the current front lines made both Trump and European leaders.

Meanwhile, Ukraine's military said it had attacked a Russian chemical plant in the Bryansk border region late on Tuesday with UK-supplied Storm Shadow missiles. The strike was called a successful hit that penetrated the Russian air defense system, with military officials noting that the plant produces components vital for the enemy’s ammunition.

Zelensky, who was due to visit Swedish defense contractor Saab on Wednesday, returned from talks with Trump last Friday, having failed to persuade the US president to provide long-range Tomahawk missiles.

As the strikes surge, the Ukrainian capital experienced a wave of attacks overnight, marking the first significant bombings since 28 September. A couple in their 60s died when a drone struck their high-rise building, and four others were killed in the wider Kyiv region, including a woman, a six-month-old baby, and a 12-year-old girl.

The capital remained on ballistic missile alert for most of the night, reverberating with explosions, while emergency teams battled fires in residential structures. Across the nation, Russian forces targeted energy infrastructures, leading to emergency power outages in several regions.

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