7 September 2014 Last updated at 01:42 BST BBC
There has been heavy shelling on the outskirts of the eastern Ukrainian port of Mariupol, raising concerns over whether the ceasefire is holding.
The ceasefire came into effect late on Friday.
Earlier, Ukraine’s President Petro Poroshenko said he and his Russian counterpart, Vladimir Putin, had spoken by phone and agreed the ceasefire was largely holding.
Fergal Keane reports from Mariupol.
There is video at BBC: http://www.bbc.com/news/world-europe-29095968