Ukraine military says some rebel shelling but ceasefire generally observed

KIEV (Reuters) - Ukraine's military said on Sunday pro-Russian rebels had shelled Ukrainian positions ten times since a ceasefire came into effect at midnight, but that the truce was in general being observed.

The ceasefire, negotiated in four-power talks on Thursday, foresees the creation of a neutral buffer zone and withdrawal of heavy weapons responsible for many of the 5,000 deaths in a conflict that has caused the worst crisis in Russia-West relations since the Cold War a generation ago.