"The threat of a tactical Russian victory is there, but they haven't done it yet," he said.

It comes as President Volodymyr Zelensky accused Moscow of trying to "destroy" the Donbas region.

"There were massive air and artillery strikes in Donbas. The occupier's goal here is unchanged, they want to destroy the entire Donbas step-by-step," Mr Zelensky said in his nightly video address.

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