[Osem]

Ukraine's interior minister has said that three tanks have crossed the border from Russia into rebel areas of the east and fighting is under way.

The tanks entered Ukraine along with other armour through a checkpoint controlled by rebels in the Luhansk region, Arsen Avakov said.

Ukrainian forces engaged two of them and fighting is under way, he said.

http://www.bbc.co.uk/news/world-europe-27815441