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Elsewhere in Ukraine, the mayor of Kharkiv said a drone had struck a petrol station in the city centre, and explosions were also heard in the city of Sumy.

Russia says its troops are now at the border with Ukraine's Sumy region, located next to Kursk.

Trump's comments come after widespread outrage over Russia's attack on the Ukrainian city of Sumy on Sunday, which was the deadliest Russian attack on civilians this year.

Russia's attack on the city Sumy killed at least 35 people and injured 117 others.

A Russian missile attack on the Ukrainian city of Sumy, which killed 34 people - including two children - and injured 117 others, has been strongly condemned by Kyiv's Western allies.