The Ukrainian military says it has forced Russian troops to reduce the tempo of their offensive in the northern Kharkiv region, where they launched a fresh incursion on Friday.
Combat continues in the town of Vovchansk but the situation is under control, it said.
This echoes analysis made by experts at the Institute for the Study of War (ISW), who said Russian forces have advanced eight kilometres from the border.
"Russian forces have been able to make tactical advances in northern Kharkiv Oblast since 10 May in areas where Ukrainian forces purposefully did not establish significant defensive lines," the ISW said.