Ukrainian military spokesman Andriy Lysenko told reporters that two servicemen were killed and another 16 wounded in the past 24 hours, accusing insurgents of using heavy weapons against government troops.
A rebel spokesman in the self-proclaimed Donetsk People's Republic meanwhile said that one of its fighters had been killed, the rebels' news agency reported.
The latest casualties along eastern Ukraine's volatile frontline come despite the warring sides announcing a truce deal in February that has failed to stop the violence entirely.
The deputy head of the OSCE's monitoring mission, Alexander Hug, said yesterday that 16 civilians had been killed in the region since the start of the year.
More From This Section
The OSCE said today that two mortar rounds had exploded near its monitors' cars in a rebel-controlled village northwest of the government-held city of Mariupol yesterday.
No monitors were injured in the incident, the OSCE said.
Nearly 10,000 people have been killed since the start of a pro-Russian insurgency in 2014 which Kiev and the West accuse Moscow of masterminding.