Ukraine's armed forces claim to have killed "around 100" rebel fighters near the eastern town of Snizhne.
Defence officials said government forces had also destroyed 11 missile systems and tanks but the claims could not be immediately verified.
While rebels said they had seized two settlements west of Snizhne and captured 13 Ukrainian troops, including three officers.
More top news
Drinking three to five cups of coffee a day could reduce the risk of clogged arteries and thus heart attacks, a study has found.
There are five million British expats across the globe. Many have a vested interest in May's election and many still have the right to vote.
Abba's Bjorn Ulvaeus has a boyish enthusiasm for the cashless society - and he has a challenge for ITV News viewers.