Earlier, Kremlin spokesman Dmitry Peskov said the turbine has not yet arrived but Moscow hoped it would be installed "sooner rather than later".

Russian gas giant Gazprom said on Monday it had received documentation on the turbine but some issues and risks remained.

Russia blamed the delay over the turbine when it cut gas flows through Nord Stream 1 to Germany to 40% of capacity in June. On Monday Gapzrom said flows would halve again from Wednesday, to just 20%, because another turbine needed to be halted.

(Reporting by Reuters)