Russian energy giant Gazprom says it is impossible to take back a turbine that is vital for gas supplies to Europe due to Western sanctions.
The 12m (40ft) turbine is stranded in Germany after returning from Canada where it was repaired.
Berlin insists the equipment is not affected by sanctions and accuses Russia of not honouring its contracts for political reasons.
The key Nord Stream 1 pipeline from Russia to Germany is currently running at 20% capacity, raising concerns over winter fuel supply.
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