The calculations, based on data from European gas transmission group Entsog and Gazprom's daily reports on its transit via Ukraine, showed that average daily pipeline exports of Russian gas to Europe increased to 75.6 million cubic metres (mcm) from 70.3 mcm in March.

Total Gazprom gas supplies via Ukraine and a line of the TurkStream pipeline was about 2.27 billion cubic metres (bcm) in April, calculations show. Gazprom gas supplies to Europe total about 8.14 bcm since the start of the year.

Gazprom, which has stopped publishing its own export statistics, did not respond immediately to a request for comment.

(Reporting by Oksana Kobzeva; Writing by Vladimir Soldatkin; Editing by David Goodman)