As Russian missile strikes and heavy assaults by ground troops pace deadly attacks on Ukraine, a new report by University of Virginia researchers reveals another destructive facet of Russia's invasion.

Ancient burial mounds called kurgans have been damaged in areas of Ukraine occupied by Russian forces, which could indicate a violation of international law.

President Volodymyr Zelenskiy said on Thursday that Ukrainian forces had reduced the potential of Russian troops to launch attacks in Donetsk region on the eastern front of the more than 2 1/2-year-old war.