Russia fired its biggest-ever aerial barrage at Ukraine early Sunday, killing four people and setting government offices in Kyiv ablaze, an attack President Volodymyr Zelensky warned would prolong the war.

Hours later, US President Donald Trump -- who has been trying to broker a peace deal ending the war -- said he was ready to impose more sanctions on Russia.

Russia has intensified its onslaught against Ukraine since President Vladimir Putin met Trump in Alaska on August 15 in a summit that failed to yield any ceasefire breakthrough.

After Sunday's attack on Kyiv, flames could be seen rising from the roof of the sprawling government complex that houses Ukraine's cabinet of ministers in the heart of the city -- the first time it has been hit during the three-and-a-half-year conflict.

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