Six servicemen were killed and 12 wounded in eastern Ukraine in the past 24 hours despite a ceasefire deal, Ukraine's military said, as both sides in the conflict accused the other of increasing attacks and building up weapons on the frontline.
The mutual recriminations have put further strain on a two-month-old truce between Ukraine’s military and pro-Russian rebels, which technically remains in force despite almost daily reports of casualties.
“The situation in the conflict zone remains unstable. Armed attacks by the enemy are taking place in almost all parts [of the frontline],” Ukrainian military spokesman Andriy Lysenko said in a televised briefing.
Mr Lysenko said the most active exchange of fire was in villages near the rebel-held city of Donetsk.
Mr Lysenko gave no details about the circumstances of the deaths of the six soldiers.
The Donetsk regional administration, which remains in government hands, said it had tracked 30-40 vehicles carrying “Russian military equipment” heading in the direction of Popasna, a town on the frontline west of rebel-held Luhansk.
A further 20 armoured personnel carriers and 10 tanks arrived in Debaltseve, it said in an online statement, referring to a frontline town that separatists seized from government troops in defiance of the truce in February. The report could not be independently verified.
Rebel response
Meanwhile, the leader of the self-proclaimed Donetsk People's Republic (DNR), Alexander Zakharchenko, said Ukraine had brought heavy weapons close to the city.
“Over the past two weeks more than 100 pieces of military equipment have been brought to Donetsk . . . This indicates preparation for an offensive,” the separatist news agency DAN quoted Mr Zakharchenko as saying.
Foreign ministers from Germany, France, Russia and Ukraine condemned the escalation of violence in a late-night meeting on the implementation of the ceasefire on Monday.
More than 6,000 people have been killed since fighting started last April, when pro-Russian rebels opposed to a new pro-Western government declared independence from Kiev.
Reuters