This was stated at a briefing of the NSDC speaker Andrii Lysenko, Censor.NET reports citing Ukrainian News.
"The arrival of new Russian military units to the Donbas has been confirmed," he said.
The National Security Council also states that that the terrorists are accumulating equipment and manpower for an assault on the Donetsk International Airport.
Near the village of Stanytsia Luhanska the border guards recorded the use of Russian military drones for air-observed artillery fire.
Also, according to the ATO press center, during the past day the militants carried out 13 unsuccessful attempts of fire destruction of our positions.
"Our "cyborgs" defending the strategic facilities around the airport provided an unpleasant surprise to the militants. Despite the attempts of traitors and cowards of the self-proclaimed republics to once again brandish their arms, our military positions near Pisky village and the airport remain steadfast. The enemy has retreated," the report states.
The headquarters also notes that the militants became more active in the area of Mariupol. They tried to carry out attacks on our fortifications twice. In particular, they damaged residential buildings. There are no casualties among the civilian population.
"During the second attack [our troops] returned fire. The fire point of the terrorists has been destroyed. The losses among the terrorists are being determined," the press-service summed up.
During the day five Ukrainian soldiers were wounded in the ATO area, according to the National Security Council.