Russia tightened its gas squeeze on Europe on Monday as Gazprom said supplies through the Nord Stream 1 pipeline to Germany would drop to just 20% of capacity.

Gazprom said flows would fall to 33 million cubic meters per day from 0400 GMT on July 27—a halving of the current, already reduced level—because it needed to halt the operation of a Siemens gas turbine at a compressor station on instructions from an industry watchdog.

Germany said it saw no technical reason for the latest reduction, which comes as Russia and the West exchange economic blows in response to what Moscow calls its special military operation in Ukraine.

The Dutch front-month gas contract, the European benchmark, closed 9.95% higher on news of the latest blow to Nord Stream 1. The pipeline, which has a capacity of 55 Bcm a year, is the single biggest Russian gas link to Europe.

The EU has repeatedly accused Russia of resorting to energy blackmail, while the Kremlin says the shortfalls have been caused by maintenance issues and the effect of Western sanctions.

Politicians in Europe have said Russia could cut off gas flows this winter, which would thrust Germany into recession and lead to soaring prices for consumers already grappling with higher prices for food and energy.

Germany was forced last week to announce a $15 billion bailout of Uniper, its biggest company importing gas from Russia.

Putin Warning

President Vladimir Putin had foreshadowed the latest cut, warning the West this month that continued sanctions risked triggering catastrophic energy price rises for consumers around the world.

Russia had already cut flows through Nord Stream 1 to 40% of capacity in June, citing the delayed return of a turbine that was being serviced by Siemens Energy in Canada—an explanation that Germany rejected as spurious.

It then shut Nord Stream 1 altogether for 10 days of annual maintenance this month, restarting it on July 21 still at 40% of normal levels.

The servicing of that first turbine is still a matter of dispute as it makes its way back to Russia through a tangle of paperwork and conflicting statements.

Gazprom said on July 25 it had received documents from Siemens Energy and Canada but “they do not remove the previously identified risks and raise additional questions.”

It said there were also still questions over EU and U.K. sanctions, “the resolution of which is important for the delivery of the engine to Russia and the urgent overhaul of other gas turbine engines for the Portovaya compressor station.”

Siemens Energy said the transport of the serviced turbine to Russia could start immediately, and the ball was in Gazprom’s court.

“The German authorities provided Siemens Energy with all the necessary documents for the export of the turbine to Russia at the beginning of last week. Gazprom is aware of this,” it said.

“What is missing, however, are the customs documents for import to Russia. Gazprom, as the customer, is required to provide those.”

The German company said it saw no link between the turbine issue and the gas cuts implemented or announced by Gazprom. Gazprom did not immediately reply to a request for comment.

The Kremlin said earlier that Moscow was not interested in a complete stoppage of Russian gas supplies to Europe, which is straining to fill its underground storage before the peak demand winter season.

The disruption has raised the risk of gas rationing on the continent, with the EU proposing to member states last week that they cut gas use by 15% between August and March compared with the same period of previous years.

Russia is the world’s second largest oil exporter after Saudi Arabia and the world’s largest exporter of natural gas. Europe imports about 40% of its gas and 30% of its oil from Russia.

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