Ukrainian troops fire a howitzer at a front-line position near the city of Bakhmut, Ukraine, on April 23.(Reuters)More than 20,000 Russian troops have been killed and 80,000 have been wounded in Ukraine since December, the U.S. National Security Council said.The numbers are based on "intelligence that we were able to corroborate over a period of some time," said NSC spokesman John Kirby.
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