Ukraine soldiers killed in Sloviansk clashes
5 May 2014 Last updated at 23:41 BST
Four Ukrainian soldiers have been killed and an army helicopter shot down by pro-Russian militants near the eastern city of Sloviansk, Kiev says.
It says the gunmen used heavy weapons against Ukraine's units involved in the "anti-terror" operation. Casualties were also reported among the rebels.
Fergal Keane reports from Sloviansk.