Ukraine's military says two of its soldiers have been killed and six wounded in fighting between government forces and separatists in the country's east.
Military spokesman Andriy Lysenko said on June 21 that the casualties were caused by mortar fire and shelling in the Donetsk region during the previous 24 hours.
"Armed hostilities have risen significantly" around the port city of Mariupol, Lysenko added. "The area of our positions being shelled has increased."
Meanwhile, the pro-Russian separatists said one civilian was killed and at least another wounded, accusing government troops of shelling residential areas of Donetsk and other rebel-held towns.
Fighting has killed more than 6,400 people in eastern Ukraine since April 2014.
In recent weeks, Kyiv and rebels have accused each other of increasing attacks despite a cease-fire agreement signed in Minsk in February.
The foreign ministers of Russia, Ukraine, Germany, and France are due to meet in Paris on June 23 to try to salvage the accord.