Pro-Russian separatist leader Igor Strelkov has resigned, the rebel group Donetsk Republic said on its website.
It said Vladimir Kononov would replace Strelkov as the new military commander.
Strelkov's resignation is the third change at top of the rebel leadership in the past week.
More top news
Brent Stirton won the Wildlife Photographer of Year award for his image Memorial to a Species, taken at a game reserve in South Africa.
Analysis of queues found drivers faced 1.35 million traffic jams, costing them in wasted time, fuel and unnecessary carbon emissions.
It will be a cloudy day across much of Wales, central and southern England with outbreaks of rain and drizzle.