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"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.

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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.