First mobilized Russians appear in southern Ukraine: some have already been killed 

He told it "Espreso.TV" live on air.

"Additional Russian resource is always bad for the battlefield. Because it is always people in tanks, with machine guns and other military equipment. Therefore, no matter what quality they are, they will shoot at us in any case," Kostenko explained.

Ukrainian Security Service colonel reported that the first mobilized Russians have already been killed in the South of Ukraine.

"However, I cannot disagree with the fact that everything really depends on the quality of Russia's mobilization resources. We understand that the first mobilized from Russia are already in the South of Ukraine. And the first killed are also there. Nothing changes for us. Our artillery will hit Russians harder, no matter how many there are," he added.