Russia fired a wave of drones and missiles at Ukraine overnight, killing at least six people including two children, and cutting power to tens of thousands, officials said Sunday.

Ukrainian President Volodymyr Zelensky said the attacks, which also wounded a dozen other people, showed Moscow was aiming to "inflict harm" on civilians, and announced that Kyiv had beefed up its air defences in response.

Russia has rejected US calls to halt its nearly four-year invasion of Ukraine, instead pushing forward with its ground assault while renewing its campaign of strikes against Ukraine's energy grid.

Both countries also claimed to have made gains in the fighting in the key eastern city of Pokrovsk, where Ukraine is under pressure from an intense Russian assault involving thousands of troops.

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