Russia said on Wednesday that it was continuing to battle Ukrainian troops that crossed into the border region of Kursk a day earlier, APA reports citing Deutsche Welle.
"The operation for the destruction of Ukrainian army units is continuing," the Russian Defense Ministry said on social media.
"The enemy's movement further into Russian territory has been prevented."
Kursk's acting governor said several thousand people had been evacuated from the border region.
"In the last 24 hours, our region has been heroically resisting attacks," Alexei Smirnov said.
He also urged locals to donate blood.