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
Overnight it will be cooler and fresher but most places will stay dry with a nippy start to Sunday.
X Factor contestant Raign seems to impress the Wembley audience with her own song even though Cheryl finds her "really annoying".
YouTube superstar Alfie Deyes got a sense of how far he has come when thousands of fans descended on his latest book signing in London.