Heavy fighting has been reported in rebel-held areas of eastern Ukraine, with street clashes in the centre of the key city of Luhansk.
Government forces have regained one district in the city, officials say.
Shelling has been reported near the rebel headquarters in Donetsk, the other major rebel-held eastern city.
As the number of civilian casualties rises, the Kremlin says Russian President Vladimir Putin is due to meet Ukraine's Petro Poroshenko next week.
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