The Organisation for Security and Cooperation in Europe will deploy four unmanned aerial vehicles along Ukraine's border with Russia and in the war zone as part of a peace deal agreed by Moscow and Kiev on September 5, OSCE spokesman Michael Bociurkiw told AFP.
He said the vehicles were still clearing customs and would only be deployed once they are reinforced by teams of civilian experts who operate them from the ground.
Bociurkiw said it was still unclear if those unmanned surveillance vehicles would be part of the OSCE mission or flying separately.
"Negotiations (on the subject) are ongoing at a very high level," he said by telephone.
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He added that the OSCE intended to double the size of its monitoring mission in east Ukraine from 80 to 160 personnel. Its entire team in the war-torn former Soviet country would also grow from 250 to 500 staff members.
"We will remain an unarmed civilian mission," Bociurkiw said.
It was reinforced by a September 19 deal for the rivals to set up a 30-kilometre buffer zone along the front line and to pull back their heaviest guns from eastern villages and towns.
Ukraine's parliament separately approved President Petro Poroshenko's proposal for the rebel-held region to enjoy three years of limited autonomy while political negotiations continue.
The agreements have helped calm fighting across most of the region. But sporadic violations have still killed 80 Ukrainian soldiers and civilians -- as well as an undisclosed number of insurgents -- since the first deal was signed.