Pro-Russian rebels have shot down two of Ukraine's army helicopters during an "anti-terror" operation in the eastern city of Sloviansk, Kyiv says.
BBC: Sloviansk rebels down army helicopters
Sloviansk rebels down army helicopters on May 2.
Pro-Russian rebels have shot down two of Ukraine's army helicopters during an "anti-terror" operation in the eastern city of Sloviansk, Kyiv says.