Ukraine says it has killed around 400 Russian soldiers in a missile attack on the occupied Donetsk region.
The missile targeted a building in the city of Makiivka, where Russian forces were thought to be stationed.
The figure has not been verified. Pro-Russian authorities acknowledged casualties, but did not confirm the figures being reported.
In Kyiv, air raids sounded on Sunday night, as the latest wave of drone and missile strikes from Russia continued.
Daniil Bezsonov, a senior Russian-backed official in the occupied parts of Donetsk, said the missile struck Makiivka two minutes after midnight on New Year's Day.
"A massive blow was dealt to the vocational school from American MLRS Himars," he said, referring to US-provided missiles.
"There were dead and wounded, the exact number is still unknown," Bezsonov added in a post on the messaging app Telegram.
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