Russia has suffered its worst ever month for casualties since the start of the war in Ukraine, the UK chief of defence staff has told the BBC. Admiral Sir Tony Radakin said Russia’s forces suffered an average of about 1,500 dead and injured "every single day" in October, bringing its losses to 700,000 since the war began in February 2022.

Russia does not disclose the number of its war dead, but Western defence officials have said October's death toll was the heaviest so far.

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While allies of US President-elect Donald Trump insist that Ukrainian President Volodymyr Zelensky may have to cede territory to bring the conflict to an end, Sir Tony insisted that Western allies would be resolute for "as long as it takes".

"That’s the message President Putin has to absorb and the reassurance for President Zelensky," he told the programme.