Russian gas giant Gazprom has increased its gas transit via Ukraine to Europe by about a quarter, to 300 million cubic meters per day, gas transport firm Ukrtransgaz said on Wednesday.

Ukrtransgaz said a repair of both two lines of the Nord Stream pipeline between Russia and Germany was the reason for the jump in transit, Reuters said.

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Both lines are shut for planned maintenance July 16-30.

Russian gas volumes piped via Ukraine to European consumers in the first five months of 2019 rose to 37.6 billion cubic meters (bcm), up 8 percent from a year earlier.

More than a third of Russia's gas exports to the European Union cross Ukraine, providing Kyiv with valuable transit fee income.

Russia's gas exports via Ukraine fell 7 percent in 2018 to 86.8 bcm.