Photo from UNIAN

"According to different estimates, their share is about 30% of the combatants who are in Ukrainian territory. Another 30% are the so-called "Cossacks" and various groups that are often non-controlled. And the remaining 30% are those Ukrainian citizens who continue fighting against the Ukrainian government," he said, Channel 112 Ukraine reported.

Read alsoDeputy minister Tuka: Liberation of Donbas may start in autumnRussia reduces financial assistance to the quasi-formations in Donbas every month, Tuka said.

He also added that Russian financial injections in occupied Crimea had also decreased.

As UNIAN reported earlier, Adviser to Ukraine's Interior Ministry, Ilya Kiva, claimed Russian troops had started to partially withdraw from Donbas, rolling back to Russian territory.