U.S. intelligence agencies had alerted top military and administration officials as early as Wednesday about a potential military assault against prominent Russian defense authorities, plotted by Prigozhin.
More than 3,000 people will be evacuated in the Russian city of Belgorod on the border of Ukraine after an explosive was found, the local governor said on Saturday.
The Pentagon is investigating the leak of classified American and NATO plans to bolster the Ukrainian military ahead of a planned offensive against Russian troops.