Between 10,000 and 13,000 Ukrainian soldiers have been killed so far in the war against Russia, Ukraine's presidential adviser says.

Iran PressEurope: The remarks by presidential adviser Mykhailo Podolyak in an interview with a Ukrainian television network on Thursday appeared to be the first estimate of dead since late August when the head of the armed forces said nearly 9,000 military personnel had been killed.

"We have official figures from the general staff, we have official figures from the top command, and they amount to (between) 10,000 and 12,500 to 13,000 killed," Podolyak told the Kanal 24 channel, according to Reuters.

"We are open in talking about the number of dead," he added, saying more soldiers had been wounded than had died.

Last month America's top general estimated that Russia's military had seen more than 100,000 of its soldiers killed and wounded in Ukraine and added Kyiv's armed forces "probably" suffered a similar level of casualties.

Zelenskiy advisor Oleksiy Arestovych, speaking in a video interview on Wednesday, claimed the Russian death toll was around seven times that of Ukraine's.

This is while the last official figure issued by Russia’s Ministry of Defense in September put the number of Russian dead at 5,937.

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