Ukraine's military has recaptured the separatist town of Slaviansk from pro-Russian rebel factions.
Pro-Russian separtsist said there were forced to leave their positions after the assault by government forces, Interfax news agency said. Separatist leader Aleksandr Borodai was quoted as saying:
"Given the disproportionate numerical superiority of the enemy troops, units of the armed forces of the Donetsk People's Republic were forced to leave their previous positions on the northern sector of the front and go to pre-prepared positions."
More top news
Mr Osborne said he is "not the person to provide the unity my party needs".
Actress Lena Dunham has criticised Kanye West's "disturbing" new music video for depicting a host of naked celebrities in bed together.
David Cameron is to meet leaders of other EU states for the first time since the referendum vote for Brexit.