MINSK/KIEV (Reuters) - Ukraine's President Petro Poroshenko warned on Wednesday of a growing threat of large-scale military action in the east of the country, but peace envoys reported some progress towards full implementation of a fragile ceasefire agreement.
Earlier Ukraine's military said five of its servicemen had died in the past 24 hours, while pro-Russian separatist officials said three rebel fighters had been injured in the same period in attacks from the Ukrainian side.
Casualties are reported almost daily despite the truce, brokered in February in the Belarussian capital Minsk to end a year-old conflict in which more than 6,000 have been killed.
"The threat of large-scale military action from Russian terrorist groups not only remains but is growing," Poroshenko told a security and defence council meeting in Kiev.
He said there were more than 40,000 separatist fighters in the rebel-controlled territories and a further 50,000 Russian troops across the border, according to a statement posted on his website.
Later, the security council said it had approved plans to "accelerate the construction of fortified lines and borders" to improve Ukraine's defences, according to an online statement.
Military spokesman Andriy Lysenko said four Ukrainian servicemen had been killed by a landmine and a fifth in a rebel ambush since Tuesday.
But envoys meeting in Minsk on Wednesday to explore ways of shoring up the ceasefire struck a more upbeat note.
"The work was constructive, laying the foundation for talks and decision-making at the negotiating table and not on the battlefield," Heidi Tagliavini of the OSCE rights watchdog told a briefing after the talks.
Also attending the Minsk meeting were representatives from Russia, Ukraine and the pro-Russian separatists.
Russia's envoy, Azamat Kulmuhametov, said the talks represented a "serious step towards a political settlement" to the conflict.
"What has been done today ... will promote the ceasefire."
He and the separatist envoys said the meeting had addressed administrative issues such as pension payments and the reopening of banks in rebel-controlled areas of eastern Ukraine.
International aid organisations have warned of a brewing humanitarian crisis in many parts of the rebel-held east, where thousands of vulnerable people including the elderly have been cut off from social subsidies as a result of the conflict.
Kiev's representative at the peace talks, former Ukrainian president Leonid Kuchma, emphasised the need for a total cessation of violence.
"For us the most important thing today is a complete ceasefire," he said.
(Writing by Alessandra Prentice; Editing by Gareth Jones)
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