"Over the day the losses of the Ukrainian armed forces amounted to about 100 servicemen," the MoD said in a statement.
Overall, Ukraine has lost over 21,350 soldiers in the Kursk Region since clashes erupted there, the ministry added.
On August 6, Ukrainian forces launched an incursion in Russia's Kursk Region. Russian President Vladimir Putin called the move a large-scale provocation aimed at civilians and vowed a proper response. Russian forces launched a counteroffensive.