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Here's what the estimated 100 leaked Pentagon documents have revealed about the Russian military:

-- Up to 43,000 Russian soldiers have been killed in action as of early 2023, with an estimated total casualty count between 189,500-223,000. 

That compares with the up to 17,500 Ukrainian soldiers killed in action and 124,500-131,000 casualties reported in the U.S. documents.

Russia's death toll appeared to have been altered to a fraction of the original number before it was circulated on pro-Russian channels on the popular messaging app Telegram.

-- Russia's military appears to acknowledge its setbacks, with the General Staff's National Defense Control Center (NDCC) reporting in February that its forces in eastern Ukraine had "decreased combat capability." 

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