Russian attacks in north-east Ukraine have prompted the evacuation of almost 1,800 people from the Kharkiv area, the regional governor has said.

Heavy fighting has continued in the border area following¬†Russia’s surprise incursions on Friday.

Kyiv has been expecting a Russian summer offensive for some time – including a possible attempt to capture Kharkiv, Ukraine’s second city.

But Ukraine insists its forces are able to resist any attack.

On Saturday Russia said it had seized five villages near the town of Vovchansk in its latest offensive. The BBC has not been able to independently verify the claim.