The prosecutor's office of the eastern city of Kharkiv reported the deaths of another five people over the past 24 hours, adding to the 13 killed by the lethal vodka in various parts of the region since Friday.
The five died after drinking "illicit cognac" in the neighbouring Donetsk region, parts of which are run by pro-Russian separatist militias, the pro-Kiev regional police office said.
The police said the deadly spirits were delivered earlier from the Kharkiv region.
Illicit alcohol is more widespread in rural regions of Ukraine, one of Europe's poorest states.
The country has been riven by corruption and a 29-month pro-Russian insurgency that has claimed more than 9,600 lives.