(Reuters) -Russia kept one of its main gas supply routes to Europe shut on Saturday, stoking fears of winter fuel shortages and spotlighting differences between Gazprom and Germany's Siemens Energy over repair work on the pipeline.

Already struggling to tame soaring gas prices, European governments had expected the Nord Stream 1 pipeline to resume flows after a short maintenance this week but Russia abruptly cancelled the restart, citing an oil leak in a turbine.

Europe has accused Russia of weaponising energy supplies in what Moscow has called an "economic war" with the West over the fallout from Russia's invasion of Ukraine. Moscow blames Western sanctions and technical issues for supply disruptions.

The latest Nord Stream shutdown, which Russia says will last for as long as it takes to carry out repairs, added to fears of winter gas shortages that could help tip major economies into recession and energy rationing.

The discovery of the oil leak on Friday coincided with the Group of Seven (G7) wealthy democracies proceeding with plans to impose a price gap on Russian oil, intending to shrink President Vladimir Putin's resources to fight the war in Ukraine.

Gas shortages also prompted European Union member Sweden on Saturday to unveil a financial support package for energy firms.

"If we do not act, there is a serious risk of disruptions in the financial system, which in the worst case could lead to a financial crisis," said Prime Minister Magdalena Andersson.

"Putin wants to create division, but our message is clear: you will not succeed," she said.

GAS PRICE RALLY EXPECTED

Gazprom said Siemens Energy was ready to carry out repairs on the pipeline but that there was nowhere available to carry out the work, a suggestion Siemens Energy denied, saying it had not been asked to do the job.

Siemens Energy has also said that sanctions do not prohibit maintenance.

Before the latest round of maintenance, Gazprom had already cut flows to just 20% of the pipeline's capacity.

"Siemens is taking part in repair work in accordance with the current contract, is detecting malfunctions ... and is ready to fix the oil leaks. Only there is nowhere to do the repair," Gazprom said in a statement on its Telegram channel on Saturday.

Siemens Energy said it had not been commissioned to carry out the work but was available, adding that the Gazprom-reported leak would not usually affect the operation of a turbine and could be sealed on site.

"Irrespective of this, we have already pointed out several times that there are enough additional turbines available in the Portovaya compressor station for Nord Stream 1 to operate," a spokesperson for the company said.