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.

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.