Russia has completely halted gas supplies to Europe via a major pipeline, saying repairs are needed.
The Russian state-owned energy giant, Gazprom, said the restrictions on the Nord Stream 1 pipeline would last for the next three days.
Russia has already significantly reduced gas exports via the pipeline.
It denies accusations it has used energy supplies as a weapon of war against Western countries.
The Nord Stream 1 pipeline stretches 1,200km under the Baltic Sea from the Russian coast near St Petersburg to north-eastern Germany.
It opened in 2011, and can send a maximum of 170m cubic metres of gas per day from Russia to Germany.
The pipeline was shut down for 10 days in July – again for repairs, according to Russia – and has recently been operating at just 20% capacity because of what Russia describes as faulty equipment.
The president of Germany’s network regulator has said the country will be able to cope – if Russia resumes delivery in the coming days.
