OSCE monitors say that weapons in militant-held Luhansk is a violation of the Minsk agreements / Photo from UNIAN

"South-east of government-controlled Svitlodarsk, our unmanned aerial vehicles have been recording a large concentration of weaponry in violation of the Minsk agreements," he said at a briefing in Kyiv on Thursday.

Read alsoDonbas war update: One Ukrainian soldier wounded in last dayHug also commented on Donbas militants' plans to stage a V-Day parade in Luhansk on May 9.

"When I see the so-called "LPR" [Luhansk People's Republic] bringing in heavy weapons into Luhansk city, I am, however, not entirely convinced that everyone understands the urgency involved. Everyone has a right to express their cultural and historical heritage, particularly when it comes to marking the 9 May Victory Day. Heavy weapons in the middle of a major city are not an honour; they are simply a violation of the Minsk accords and a threat to the people living in that area," he said.

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Read alsoPoroshenko appoints new Luhansk governorAs was announced by LPR representatives, more than 1,000 men and 74 combat vehicles will take part in the V-Day parade in Luhansk on May 9.

According to them, the mechanized column will incorporate artillery systems (35 pieces), armor – T-72 tanks, BMP-2 and BTR-80 – 21 vehicles in all, trucks, a tow truck and cars.