"We restored crude shipments on Wednesday at 2200 (1800 GMT)," said Igor Dyomin, spokesman for Russian pipeline monopoly Transneft.
Ukraine's Fuel and Energy Ministry also confirmed the resumption of supplies.
A power outage in western Ukraine halted supplies of Russian
oil to Europe via the southern spur of the Druzhba pipeline
early on Wednesday.
Supplies through a section of the pipeline in western Ukraine had been suspended because of localised power cuts, a result of bad weather.
The Ukrainian Fuel and Energy Ministry's press secretary, Fent Di, said the pipeline had been shipping about 53,000 tonnes of oil per day, but was able to increase supplies to make up for the losses.
"They can increase the capacity to 55,000-57,000 tonnes to compensate for the suspension, despite the fact that the losses are modest and none of our clients have made any claims to us," he said.
The pipeline pumps more than 1.2 million barrels of crude a day (around 160,000 tonnes) into Europe. The southern spur's capacity is about 600,000 barrels per day.
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